It depends a lot on how you are using it, but the max capacity % after "only" 30 cycles is not a super great indicator. But the general idea is that lithium batteries are good for about 1000 cycles, depending on how much capacity loss you can accept.
In my case, I'm at 34 cycles since getting my 16" on launch day, but I do quite a bit of mixed plugged in or away from dock use. And I can usually go a couple days between charging. Someone doing a full 8 hours every day on battery will wear it down much faster than I will.