No one can say for sure.
Everyones situation is different.
Its going to depend on your RH levels where you live, species, and cage setup.
You want 3-4 sessions a day for a panther.
Id say 30min to an hr after lights on, then just before halfway through the animals day, then just after the halfway point, and one in the afternoon.
You want the enclosure to dry out in between though. You also want to make sure your last session is early enough for things to dry completely before lights off.
You want at least one longer session a day, like 10+ min, but most can be around 5min or so in my opinion.