My experience has been 3 or 4 per day. Unless you are a good and regular customer, then it is negotiable.
But I was in Albany NY for work. A number of us had spouses working at the same time in Burlington, VT. So I thought, hmm, get checked our, I could fly over Sat afternoon and back Sunday evening or early Mon, find a few others and split the cost.
So I start calling FBOs in the Yellow Pages (yes, this was a while ago). First several were no longer in business. I finally got one to answer. Explained I wanted to get checked out and rent for a weekly or biweekly trip. At the time was Comm ASMEL, IA, RH, G, current CFI ASE, IA, RH, G, with about 1500 hours, Current instrument
and hundreds of 172 hours.
The person explained I needed a minimum of a 3 hour checkout for Day VFR. Another 3 hour minimum checkout for VFR night. And a third, minimum 3 hour check out for IFR, and something like 6 hours per day minimum for over night, which meant leaving on Sat and coming back late Sun they wanted 12 HOURS. WTF?!
I commented on the number of close FBOs, and the guy made a comment about yeah, it was strange, he had no idea why. REALLY??
BTW, I did not fly with them.