The only grooming need I really “schedule” is probably nail-trimming, which happens once every month for one of my rabbits and once every 2 months for my second rabbit (the latter gets very stressed by it, so we space it out more).
I think with fur grooming, it’s most important to simply be vigilant and always open to realizing “Ah, there’s a lot of fur being released. I should brush daily for a bit to help my rabbit.”
As Dana mentioned, the biggest benefit is hair ball prevention. Rabbits groom themselves as much, if not more than cats do. When cats ingest a lot of fur from their grooming, they can cough up hair balls so they don’t need to worry about it. Rabbits however are unable to do that. All fur they groom will end up in their stomachs, and sometimes during high shed periods, the amount can negatively impact their health, as Dana described.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.