My limit is usually about an hour unless they go into lounge mode, then it's fine until I go to bed or they decide to explore. Otherwise they simply just wear me down with their constant exploring. I get tired of having to check up on them every 10-15 mins to make sure they aren't going to break something like Rosey did to my torchier lamp when she thought it would be a good idea for a 7' boa to try and climb up it lol.