There is a minimum stay requirement of two nights — and no, you can't book consecutive stays within 24 hours to qualify for benefits again. (thepointsguy.com)
Each member hotel's terms and conditions regarding length of stay requirements, day of week restrictions, deposit requirements, and blackout dates vary. (historichotels.org)
I find the 25 stay requirement much easier to achieve through my standard travel means. (singleflyer.com)