So I am pretty certain of the answer but have not done it before and thought of asking the masters.

So I am participating in the Glad Slam, and I need to have hotel hits. I have an upcoming LNF rate in NYC Manhattan midtown marriott for $103 for 3 nights. Will I get 3 batches of miles for 3 separate nights?

If I break the res. in 3 separate reservations I would have to checkin, checkout every day. Marriott will see this as one stay, but would the mileage be submitted only once or three times at each checkout date?

I am thinking if separate reservations then 3 separate mileage credits, but not sure... thoughts?