How long does a red foot tortoise sleep a day?

i just got a 4 inch red foot tortoise 3 days ago. it was super active the first night moving everything around and exploring its new house. but the last two days it has been sleeping almost 22 hours a day except to eat and lay in the water. the temp is around 90 degrees in the baskin and around 82 on the other side of the tank where it has a log to hide and sleep in. the humidity is around 70 percent and i have plantation soil ( coconut shavings) with beach moss on top. i was told that the finer substrate underneath would help keep the humidity up. i mist regulary and change water a couple times a day. maybe i am just paranoid and nothing is wrong. i have over 15 years expierence in dogs, cats, rodents and fish but this is my first reptile and am worried. i am a newbee and dont know much, any advice would be very helpfull.