Your tort should be eating every day - a mound of food roughly the same size as the shell is a good guideline.
If your tort isn't eating that's usually a sign that something isn't right with the temperatures in the enclosure.
Photos of your enclosure and the light bulbs will help us to diagnose any issues. And we also need to know the 4 important temperatures: warm side, cool side, directly under the basking lamp and the overnight minimum.