Babies usually stay in their wet diapers overnight for 8 to 12 hours so you should be okay in the same wet diaper for up to 12 hours but you should use diaper rash cream as a barrier.
It's not recommended to wear the same wet diaper longer than 12 hours because you'll get a painful diaper rash which will make it hard to sit or even walk around.
The wet diaper wearing all day may seem fun to you and that's okay but the rash you'll get as a result would not be so fun.