I don't get to do 30 miles nearly as often as I would like.
I'm still in full time employment, so during the week, my rides are either commutes (15.3 miles each way), or are after work if WFH, when I can rarely spare more than about an hour to an hour and a half, so usually 15-23 miles. I do feel that s enough to be worthwhile.
But I can do a fair bit more than that before getting too tired, and quite often manage a 30 miler (or more) at the weekend. The most I have done to date is a 55 mile ride a few weeks ago.