It doesn't look too long to me. Feeding on a slate tile and letting him rip of pieces of food from a large leaf will help keep it filed down. Even with this some might need a trim here and there.
Whatever you are feeding plants/greens - don’t trim, make your tortoise do the cutting. Hibiscus stems, leaves & flowers, Rose of Sharon leaves & flowers & stems, etc. Dandelion, flowers, stems & roots. Don’t make it easy for them to eat - make them bite, rip, tear apart.