When should you change your Double Dip setting?
I just completed a stay Tuesday where I chose Points + Miles (under $500 at a Doubletree) and would like to change it to Points + Points for a stay (under $500 at a Hampton Inn) starting Thursday. My points and miles from Tuesday haven't posted yet, so I'm not sure if it's safe to change it yet, but I also want to make sure it's not locked in at checkin for my upcoming stay.
So what's the cutoff? 24 hours before checkin? Checkin? Checkout? Posting?