If you're able to get an item this powerful, surely a player would also have access to Wish by then. Could you cast the wand's effect and then wish for the paradise to be permanent? 

Quote from DiceFarmer >>

If you somehow managed to get a hold of two of these rods, spent your paradise time with the first, and then immediately thereafter activated the second one and walked through with both rods, would the time spent in the paradise of the other rods creation count toward the recharge of the first rod?

If so, doing some math, this means that with two Rods of Security you and up to 19 other people could live in paradise forever; only having to return to the material plane for a few seconds every ten days.

 I would say yes

Quote from Iron_Theurge >>

Let's say you're a high-level magic-user (in my case a 16th lvl Storm Sorcerer) who has the power to take up to 199 people out of a city or environment that is about to be incinerated by some war or other event. Same character (Storm Sorcerer) also has a Staff of the Magi and can cast Plane Shift through staff as much as the staff's charges allow.  Is the PC able to leave the people they saved in the Rod of Security to go back and help in an ongoing battle on the Prime Material? Would they be able to return to the same demiplane that they created using the Rod of Security?

 

 

 not unless they used wish to get their but they will come backe once the time is up

Quote from CanonThought >>

If you're able to get an item this powerful, surely a player would also have access to Wish by then. Could you cast the wand's effect and then wish for the paradise to be permanent? 

 depends how you worded wish/how evil the dm

Quote from Iron_Theurge >>

Let's say you're a high-level magic-user (in my case a 16th lvl Storm Sorcerer) who has the power to take up to 199 people out of a city or environment that is about to be incinerated by some war or other event. Same character (Storm Sorcerer) also has a Staff of the Magi and can cast Plane Shift through staff as much as the staff's charges allow.  Is the PC able to leave the people they saved in the Rod of Security to go back and help in an ongoing battle on the Prime Material? Would they be able to return to the same demiplane that they created using the Rod of Security?

 

 

 they could level however they cvould not re enter with anything less than a wsih spell. It would waire off as usal so they are not trapecd

We have one of these in our party and used it to engage in The Obligatory Beach Episode. We played volleyball as D&D characters and it was lit.

Get 10 to have a 199 people party until the material plane is ash

 .

Note the everything else, in the disappearing part. You get 200 days worth of food every 10 days and you can take it with you. Sell it and break the world's economy. Use the 199 people as a peasant railgun. This is a very nice item.

Quote from DiceFarmer >>

If you somehow managed to get a hold of two of these rods, spent your paradise time with the first, and then immediately thereafter activated the second one and walked through with both rods, would the time spent in the paradise of the other rods creation count toward the recharge of the first rod?

If so, doing some math, this means that with two Rods of Security you and up to 19 other people could live in paradise forever; only having to return to the material plane for a few seconds every ten days.

 "Time passes normally." Would time passing normally be enough to recharge it. Then yes. I don't think it "ages" ten days I think just a certain amount of time must pass for it to build up that kind of magic again

Quote from marcosnutt >>

Getting two and leaving this reality permanently.

 

 Theoretically... if you used one inside paradise... so the first timer ends and that place is gone, you're not in paradise(1) to be taken back to the Prime Material, but then when the second timer ends where does it put you? What is closest to your pocket dimension? Back inside the pocket dimension you no longer have access to?  Do they always open the same extradimensional space? Do they blow up like a bag of bag of holding?

Time passes normal in the pocket paredise

Just make a "training arena" where there are monsters challenging you but nor killing you.

Hope this helped

Quote from DiceFarmer >>

If you somehow managed to get a hold of two of these rods, spent your paradise time with the first, and then immediately thereafter activated the second one and walked through with both rods, would the time spent in the paradise of the other rods creation count toward the recharge of the first rod?

If so, doing some math, this means that with two Rods of Security you and up to 19 other people could live in paradise forever; only having to return to the material plane for a few seconds every ten days.

 You only need 1 rod, IMO.  "The rod can't be used again until ten days have passed." is a entirely separate sentence. Just don't bring more than 18 people with you (19 total), and the Rod can completely recharge while you're inside the extraplanar space.  Hop from one space to the next every 10 days without ever going home.  Or getting old.  It's a good way to move characters forward in time without having to come up with a pile of explanations.  They spent X years in paradise, and didn't interact with any other beings.  Pop out into next campaign, and continue the story.

honestly this sounds like a good way for the players to demolish the game. just make the demi plane a training arena where the monsters will attack the players but never kill them full on. that's what it'd be for martial classes at least, you could make it a place to train magic by manifesting masters of arcane to teach you pretty much every spell you could want and more, you could make it a place to train archers with literally the whole place being target practice, you could train any blacksmiths or artificers with it being a lively dwarven forge/arcane forge where they can learn all they'd want. sure nothing can come out of the plane that was made in it, but dipping for a few years and emerging from it as lvl 20s  would make them plenty able to fight the BBEG. plus anyone who forces their way in via a wish could be stuck fighting hordes of dragons that are magically forced to protect the players. 

a good way to play this then is to have the BBEG having one and thus is virtually invulnerable until the party forces their way in via either working their butts off to get an artifact that lets them forcefully enter, or via tricking the BBEG into thinking they've accepted him as their ruler when strong enough to fight him in his home turf of the demi plane.

Do you blow up if you are carrying a bag of holding in there,  or opening one while inside ? "Placing a bag of holding inside an extradimensional space created by a handy haversack, portable hole, or similar item instantly destroys both items and opens a gate to the Astral Plane. "

It kinda qualifies...

Poorly named item... I would think a rod of security casts arcane lock, glyph of warding, alarm, things like that.

Quote from cojoMan >>

Do you blow up if you are carrying a bag of holding in there,  or opening one while inside ? "Placing a bag of holding inside an extradimensional space created by a handy haversack, portable hole, or similar item instantly destroys both items and opens a gate to the Astral Plane. "

It kinda qualifies...

 
The Rod of Security creates "an extraplanar space", not, "an extradimensional space", so no, it would not implode.
When dealing with spells and magic items, these kinds of distinctions are very important, as the designers have been very clear that such distinctions in wording is crucial to understanding how things are intended to work.

Quote from cojoMan >>

Do you blow up if you are carrying a bag of holding in there,  or opening one while inside ? "Placing a bag of holding inside an extradimensional space created by a handy haversack, portable hole, or similar item instantly destroys both items and opens a gate to the Astral Plane. "

It kinda qualifies...

 
The Rod of Security creates "an extraplanar space", not, "an extradimensional space", at first glace it can be confusing, but no, it would not implode.
When dealing with spells and magic items, these kinds of distinctions are very important, as the designers have said that such distinctions in wording are crucial to understanding how things are intended to work. Hope that helps.

Not possible, all things within must remain. The food can't be sold, in less you brought people into the paradise and feed them.