So I went back and checked every teams schedule for the month of May.
Instead of 9 occurrences whereby home teams coming back after a long road trip, with no rest, there is actually 11. I also eliminated 1 game. That makes 17 possible plays in the month of May. 11 games (teams) playing at home with no rest and 6 games (teams) playing at home after a long road trip with 1 days rest.