It took him 30 minutes to settle down from his 5L to the 12L, I tried him for 6+ hours in the 18L and he wasn't settling down. Anyway lol it's a bit off topic because I wanted to make sure the heat (judging by the picture) will go through that snake cave or not. I could just put a bit of kitchen towel in the cave so he doesn't have to lay on the plastic cave floor.