Depends on the tort. As a general rule everybody gets fed daily...or atleast the chance to eat. When out in their outdoor enclosures, often the food I prepare goes uneaten as they like whatever is naturally available. If I have an underweight animal (such as the Homes hingebacks when they arrived), they often get an added little meal.
Sulcata's and adult Leopard free graze outside from spring to mid fall. During winter they are fed large salads mixed with chopped hay every other day. They always have orchard grass hay available and will still wander outside to find some dry grass or weeds when they feel like it. Cactus pads and squashes are offered on occasion.
Indian Star's and young Leopard's are offered food in the am and again in the pm.
Sometimes the indoors ones will get a fasting day. Outsides get fed 3-4 times a week prepared. However they have natural foods available 24/7 in the pens.
We feed our 7 year old Greek (guesstimate for age) twice daily.
He eats until he's full and then walks away. Since he is maintaining at about 348 grams I feel this is working for him.
(We soak him twice a week. He already pees at every meal so it seems he is getting enough water from his meals otherwise.
We do mist him every other day.)
i feed them twice a day, in the morning (i just put it into the dish, and usually all of them suddenly wake up and go to the dish.. hehe..) and evening (before they go to sleep, or else after i clean up all of them)