Alright so here's what I got. I tested this using SZ's dash, pushing the opponent to the corner. I did this for both sides. Tip: if you want to play as player 2 just reassign your controller.
To speed things up I didn't do the tourney banned stages like Hell, street, wasteland and kratos stage.
Rooftop Day: 22 dashes (20 for player 2)
Clock tower: 21 dashes
Evil monastery: 20 dashes (21 for player 2)
Shao Kahn's throne room: 20 dashes
Soul chamber: 20 dashes
Rooftop dawn/dusk: 20 dashes (19 for player 2)
goro's lair: 19 dashes (22 for player 2)
fleshpit 19 dashes (21 for player 2)
Courtyard day/night: 19 dashes
desert: 19 dashes
coliseum: 19 dashes
shang's throne: 18 dashes
temple: 18 dashes
armory: 18 dashes
graveyard: 18 dashes (17 for player 2)
Shang's garden day/night: 18 dashes (17 for player 2)
subway: 17 dashes (18 for player 2)
training room: 17 dashes
deadpool: 17 dashes
forest: 17 dashes
pit bottom: 15 dashes (small extra dash for player 2)
pit night/day: 15 dashes
CJF should probably update the first post.