Want less AFKers and Leavers?

Clearly most people AFK and Leave because of a lack of successful Surrender voting - of which the continued denying of a Surrender can also be considered griefing (just imagine a Duo Queue that intentionally refuses to Surrender even though a game is obviously lost). It's a simple idea that should be implemented:

Game 15-25 minutes = 4-1 Surrender Vote required to end.

Game 25 minutes+ = 3-2 Surrender vote required to end.

This extends the usual "FF @ 20" another five minutes, to give a chance of a comeback, but also makes Surrendering easier afterwards to try and limit griefing (which DOES happen).