Cycle Lengths Different?

Long story but I’ve only just recently had a cycle on my own (without BC or progesterone) in a few years. (I’ve got PCOS and have made some lifestyle changes to get things going again) My first cycle length was 64 days. Is it unheard of to have drastically different cycle lengths one after another? Could my next cycle be closer to 30 days realistically?

Has anyone had a very long cycle followed by an “average” length cycle or should I expect my cycle to continue to be very long?