How many matcches do you get put in low priority for being afk?

So I had to go afk for a few minutes (folks told me to vaccume real quick) I asked my teammates if it was ok and they were cool about it.

When I tried to play another game after we won (i came back in time and helped us win) i had a 20 minute punishment. i can understand why I got the punishment, (though 20 min seems a bit extreme for a first afk offense) but its been 4 games in a row with the afk 20 minute low priority.

How many more games will be like that? (it never told me)