Grant Managers, how many do you manage?

I’m a new Grants Manager for a larger organization, managing everything post-award for all federal, state, and foundation grants. New to the industry and the role, I’m trying to understand if my workload is normal for a grants manager of a nonprofit. I’m currently managing over 55 different grants (including their reporting, compliance, project management, and budgets). Some days I am coordinating with our finance team, other days I’m working closely with HR to manage personnel allocations, I even make purchases and help with budget spend down. There are a lot of teams involved with grant projects, so I hold monthly department meetings for progress check-ins, as well as regular meetings for kick-offs, budgets, payroll, the grant writer and my boss. My question is, what is the typical number of grants to manage at once?