30 minutes in the cct should do it. Any more than that and I would suspect they are taking the p*** out of your wallet
Lots of guys with plenty of experience saying this, I have flown with pilots who are fine with this, I have also flown with others who
should be looking at this sort of time for a checkout but need WAY more, and that can be on an aircraft they have flown before. Personally, I would expect anyone with low hours doing a checkout on joining a new school to take an hour to satisfy that they are competent, but a conversion from Piper to Cessna or visa versa should be possible without anything much extra.
The ATA girls did a great job, but the circumstances were a little more exceptional, and if they DID bend one I suspect it would have been more acceptable than a low hour PPL bending a club machine.