The desert tortoises live approximately 50 to 80 years; they grow slowly and generally have low reproductive rates. They spend most of time in burrows, rock shelters, and pallets to regulate body temperature and reduce water loss.They are most active after seasonal rains and are inactive during most of the year.esert tortoises can grow up to 4–6 in (10–15 cm) in height. They can range in weight from 11 to 23 kilograms (24 to 51 lb). The front limbs have sharp, claw-like scales and are flattened for digging. Back legs are skinnier and very long.