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Genrally, for a growing tortoise, I like twice a week for the calcium and once a week for the vitamin supplement, but it really does depend on the diet. Some might need more and some might need less.
Try to feed mostly weeds, leaves and flowers, supplement with some original Mazuri once or twice a week, and you won't need much supplementation at all. Feed a lot of grocery store greens and you'll need more fiber and supplementation.
Don't forget to add in some protein once in a while for a RF.