Actually I noticed the same thing happens on United and they don't post past the date you requested them. Nor do they post past the 1st of the month. For example, I requested 300k miles on the Dec 19 and I got 12.5k+.5k everyday from Dec 1->Dec 19 and not after that. Weird... I requested 25k on Dec 10 and got 12.5k+.5k on Dec 9 and Dec 10 but the Dec 19 doesn't overwrite Dec 9 and Dec 10 (i.e. I got a total of 12.5k+.5k on Dec 9 and Dec 10 not 25k+1k if it weren't a limit of one per day).