If you want to get realistic then you could take the number of seconds in an hour (3600) and divide that by the number of seconds in a round (6) to get the number of turns the creature would have in an hour. 3600/6 = 600 Now you'd take the creature's flying speed (80) and multiply it by their number of turns (600) to get the number of feet they travel in an hour. 80*600 = 48,000 Now divide the number of feet per hour (48,000) by the number of feet in a mile (5280) to get their miles per hour. 48,000/5280 = 9.0909090909-
Now I'd just clean it up by first rounding it down to 9 and maybe call that good, or continue to justify that a creature isn't moving at that top travel speed at all times and lower it a little more, whether from uneven terrain (for walking), roads or trails zigzagging (walking), not heading directly for the target cause of lack of landmarks (flying), wind turbulence (flying), rough terrain like swamp or thick forest (walking), or anything else.
The Dungeon Master's Guide (DMG) actually says that 8 miles per hour is fine and the Player's Handbook (PHB) and DMG both say that mounts only travel for a certain amount of time before resting. The DMG expands on it by saying that for flying creatures by saying they can fly for 3 hours, then have to rest for 1, and they can only fly for 9 hours in a day.
PHB - Ch 8: Adventuring - Movement - Speed - Travel Pace "Mounts and Vehicles. For short spans of time (up to an hour), many animals move much faster than humanoids. A mounted character can ride at a gallop for about an hour, covering twice the usual distance for a fast pace." "Certain special mounts, such as a pegasus or griffon, or special vehicles, such as a broom of flying, allow you to travel more swiftly. The Dungeon Master’s Guide contains more information on special methods of travel."
DMG - Ch 5: Adventuring Environments - Unusual Environments - The Sky "A creature that serves as a flying mount must rest 1 hour for every 3 hours it flies, and it can’t fly for more than 9 hours per day. Thus, characters mounted on griffons (which have a flying speed of 80 feet) can travel at 8 miles per hour, covering 72 miles over 9 hours with two 1-hour-long rests over the course of the day. Mounts that don’t tire (such as a flying construct) aren’t subject to this limitation."
That should allow you to calculate whatever mount you're using and come up with a decent gauge of how fast the PCs would be moving.
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Good luck and may you roll 20's when you need them and 1's when you need a laugh. - myself
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So if we look at a griffon flying speed, it is 80. How would we calculate the amount of time it takes for it to travel for 1 mile?
It's as fast as the DM says.
Or you can extrapolate and say it's just under three times as fast as on foot.
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Travel speed is usually calculated as speed÷10 MPH. So thay would be 8 MPH or 1 mile per 8 (7.5) minutes.
If you want to get realistic then you could take the number of seconds in an hour (3600) and divide that by the number of seconds in a round (6) to get the number of turns the creature would have in an hour.
3600/6 = 600
Now you'd take the creature's flying speed (80) and multiply it by their number of turns (600) to get the number of feet they travel in an hour.
80*600 = 48,000
Now divide the number of feet per hour (48,000) by the number of feet in a mile (5280) to get their miles per hour.
48,000/5280 = 9.0909090909-
Now I'd just clean it up by first rounding it down to 9 and maybe call that good, or continue to justify that a creature isn't moving at that top travel speed at all times and lower it a little more, whether from uneven terrain (for walking), roads or trails zigzagging (walking), not heading directly for the target cause of lack of landmarks (flying), wind turbulence (flying), rough terrain like swamp or thick forest (walking), or anything else.
The Dungeon Master's Guide (DMG) actually says that 8 miles per hour is fine and the Player's Handbook (PHB) and DMG both say that mounts only travel for a certain amount of time before resting. The DMG expands on it by saying that for flying creatures by saying they can fly for 3 hours, then have to rest for 1, and they can only fly for 9 hours in a day.
PHB - Ch 8: Adventuring - Movement - Speed - Travel Pace
"Mounts and Vehicles. For short spans of time (up to an hour), many animals move much faster than humanoids. A mounted character can ride at a gallop for about an hour, covering twice the usual distance for a fast pace."
"Certain special mounts, such as a pegasus or griffon, or special vehicles, such as a broom of flying, allow you to travel more swiftly. The Dungeon Master’s Guide contains more information on special methods of travel."
DMG - Ch 5: Adventuring Environments - Unusual Environments - The Sky
"A creature that serves as a flying mount must rest 1 hour for every 3 hours it flies, and it can’t fly for more than 9 hours per day. Thus, characters mounted on griffons (which have a flying speed of 80 feet) can travel at 8 miles per hour, covering 72 miles over 9 hours with two 1-hour-long rests over the course of the day. Mounts that don’t tire (such as a flying construct) aren’t subject to this limitation."
That should allow you to calculate whatever mount you're using and come up with a decent gauge of how fast the PCs would be moving.
Good luck and may you roll 20's when you need them and 1's when you need a laugh. - myself