Sadly I think it needs some heavy tweaking as you are part way between 4th level Otilukes Resilient Sphere and 8th level anti magic field and yours would be an "affect other" version of them with upto x24 the duration, Ithink base level 6 at a minimum and have a duration of 1 minute not 24 hours mainly due to you saying a target can make asave at the end of every round, that would be 10 potential saves per miute or 100 per hour so they would likely make their save long before the duration ran out. The wording needs a bit of tidying up as well as you say some one trapped in it can use magic items but then if it would not work in an anti magic field it wont work in the prison, which means no magic items work and magic potions become mundane liquid, I'd also add a material component of a Beholder Eye (it doesn't have to be the main anti magic cone one) that the spell does not consume but that is just for a thematic reason.
I think I'd have base level 6 but if the target fails their save they cannot cast any innate/racial spell (such as Drow Magic or Magic Initiate) or use spell slots of 5th level or lower to cast spells. They can then still activate wands/staffs/magic items to cast spells and use magic potions. You could then up cast it so 7th level they cannot cast spells/use spell slots of 6th level or lower, 8th level they cannot cast spells/use spell slots of 7th level or lower and 9th level they cannot cast spells/ use spell slots of 8th level or lower. I think a fair trade off would also be "due to the strain invovled with cutting another spell caster off from the weave of magic the caster of this spell cannot cast any spell higher than a cantrip whilst concentrating on this spell".
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Please tell me if you think this spell is over-powered:
https://www.dndbeyond.com/spells/540641-mages-prison
Maybe make it level 6. And just make the duration longer. Maybe +6 hours for each slot level above 6?
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Sadly I think it needs some heavy tweaking as you are part way between 4th level Otilukes Resilient Sphere and 8th level anti magic field and yours would be an "affect other" version of them with upto x24 the duration, Ithink base level 6 at a minimum and have a duration of 1 minute not 24 hours mainly due to you saying a target can make asave at the end of every round, that would be 10 potential saves per miute or 100 per hour so they would likely make their save long before the duration ran out. The wording needs a bit of tidying up as well as you say some one trapped in it can use magic items but then if it would not work in an anti magic field it wont work in the prison, which means no magic items work and magic potions become mundane liquid, I'd also add a material component of a Beholder Eye (it doesn't have to be the main anti magic cone one) that the spell does not consume but that is just for a thematic reason.
https://roll20.net/compendium/dnd5e/Spells:Resilient Sphere/#h-Resilient Sphere
https://roll20.net/compendium/dnd5e/Antimagic Field#content
I think I'd have base level 6 but if the target fails their save they cannot cast any innate/racial spell (such as Drow Magic or Magic Initiate) or use spell slots of 5th level or lower to cast spells. They can then still activate wands/staffs/magic items to cast spells and use magic potions. You could then up cast it so 7th level they cannot cast spells/use spell slots of 6th level or lower, 8th level they cannot cast spells/use spell slots of 7th level or lower and 9th level they cannot cast spells/ use spell slots of 8th level or lower. I think a fair trade off would also be "due to the strain invovled with cutting another spell caster off from the weave of magic the caster of this spell cannot cast any spell higher than a cantrip whilst concentrating on this spell".