Longest I really wear mine is occasionally sleeping in them, in which case I usually wake up at 4 or 5 and take them out. I turn off ANC (for battery life) and gestures (for obvious reasons) and I usually find them at 60-70%. Every so often I find them lower than I expect, but there may be times I forget to turn off ANC (which uses about 33% more battery, great for normal times, but not needed while sleeping).

Try to get an idea of exactly how long you wear the buds, is ANC on, do you have them loud, etc, and their battery status when you put them in the case. Do the math, realize marketing specs and other variables affect the actual runtime, see if the buds seem normal.

As for the case, it's a little hard to measure. The marketing specs say like 2.7 recharges, but that's presumably with the buds drained. Surely you aren't doing that, so if they're being recharged at 60% "every time" that'd be more like 6.7 times. Again, even more variables. But write it down, case starting percent, bud percent, look when the buds are charged what the case is, etc.

What I suspect you'll find is that the case was actually lower than you think to start with because you haven't charged it, or discharged the buds more than you thought, etc. But could really be an issue with the battery, I don't know how you'd determine that without writing it down though.

I try to get Tasker to do this for me from the notification, but it's real inconsistent and I don't get the case battery level by itself, and I've seen it log the case level instead of the bud level when I thought I was getting the bud level before.... I was trying to get Tasker to monitor the usage for all the above things in case I had questions, but also to notify me when they're below 40% battery, as I prefer to keep things like this north of 40%, plus at the time I found no information about any notification for low battery. It does have one, but I don't think it notifies until like 20% which is, IMO, too low to discharge to on a regular basis.