I've had to wait up to 10 days this year twice for missing stays to post. I'll try what the previous poster suggested as it beats what I'm doing now.
On the whole, the submitting stays manually to MR is one of the few downsides, at least for me, about the program. It's almost always compensated by quality stays and superior customer service that've been extended to this lowly MR silver, so the good outweighs the bad and keeps me as an overall satisfied MR collector.