i basically refuse to book a checkride more than two weeks out, or else i end up booked a month + out. I keep a list about 2 pages in my pocket notebook of names and phone numbers to fill the schedule from.
The system would run a lot more efficiently if people would show up for checkrides qualified and prepared. in 2023 my disqualification rate is 15%. Sometimes experience requirements aren't met, airplane maintenance isn't current, maintenance records can't be found, airworthiness/registration certificates are wrong or expired, tires have cords showing, etc etc. The 15% doesn't include the problems I catch before the checkride when I have the ability to check XC routes or see a problem on the 8710 etc, but it also doesn't include the tests that have to be discontinued after the oral exam because the airplane fails preflight.
There of course are regular weather postponements and legit reasons for cancellation, can't do anything about that.
In previous years my pass rate has run in the low 70's for all checkrides combined. I do Private Glider through ATP-Multi and all CFI's. This year it's been in the low 60's. The last few months have been closer to 50.
So between weather, disqualifications, and failures, a very large portion of the scheduled checkrides have to be re-scheduled at least one. It is not uncommon at all for an applicant to finish their checkride on the third slot they have scheduled. So the names on that list don't get a slot very quickly.
I'd personally be quite happy if we had a few more DPE's in our area. I'd be even happier if disqualifications were rare and the pass rate was in the 80-90% range.