No idea for MAY, but DH & I were there in "early" Feb and the times were:
10AM, 1PM and 4PM (in that time frame) (only 3x a day)!! Now that was probably because it was off-season. They may have added a later one. The show seems (as I recall) to be a good 60 minutes long. We had to schedule our day at MGM around those times so we would not miss it.