I don't really get long expiration times. I get a little bit, but I'm saying an hour tops. Why would they expire in a month (or longer)? That's just people taking advantage (which if they will let you, why not?). To me, the point is to allow people to ride while others in their group can't be left alone. If that's the case, the other person should have to ride right after. If you have an ADR/FP close then you shouldn't get in line for that ride.
Once again, if they allow it I don't blame people taking advantage. However, they shouldn't be so stupid about it.