Mazuri recommends feeding the pellets every day.
They recommend you feed the equivelant of 1%-4% of the tortoise's bodyweight in pellets. EX: A 100 gram tortoise would get 1-4 grams of Mazuri a day. I've forgotten how much the average pellet weighs.
I've raised russians for a few years, and have produced 10 hatchlings (9 this year).
My wild-caught adults liked the Mazuri sometimes. My first hatchling liked it, and grew quickly on it, reaching sexual maturity (he chases, head bobs, and mounts females) in two years.
I've got another hatchling at home now. I feed it only weeds, greens, flowers. It is growing at a much slower rate.
I'd say make the Mazuri the smallest part of the diet possible. A pellet a year is more than enough :->
Kidding. I decided there was no need for the stuff. If you feed them a pellet here and there, kind of like a food supplement, that would be OK. I tried for awhile to feed my torts at the recommended 1-4% of bodyweight and they didn't like it that much. Mazuri also states that you can add vegetation and hay to the diet, I think roughly 20% of the total diet (not the animal's weight!).
Frequent discussions on Mazuri on the forum has revealed that no one (that I recall) uses the product daily as recommended. Most people seem to use it as a once or twice weekly substitute for greens/weeds.
If you have just a yearling russian, you can do very well feeding it weeds and greens, a little chopped carrot, some hibiscus and dandelion flowers, etc. And add calcium or calcium/d3 as needed. If you continue with the Mazuri, I recommend (only my opinion based on experience) that you use it as supplement. I found it was a convenient way to give the torts calcium. First soak the pellet and then roll it lightly in calcium powder.
I enjoy planning a varied diet that I extract from my yard and the grocery store.