How long does low priority queue last?

So I was in the middle of a game when I was told I had to drive my little sis to a piano I was gone for probably 6 minutes as its pretty close to home. I got dc'd which i expected. Got back for the end of the game and you know its what ever I probs deserve that leaver buster. I then had low priority queue and waited out to be greeted with another low priority queue while matchmaking my next game after that.