Seems to me this is Prime's favorite show for a Marathon. Anyway, the M*A*S*H Marathon starts at 12:00PM ET and runs to 6:00PM ET this Saturday, May 21st, according to their commercials.

Here's their Website ( http://www.canada.com/entertainment/tvchannels/prime/index.html) in case they post anything on it. It looks like their schedule is temporary down, but it might be back up soon.