Following on from the thought about not breaking the KOTH ring it makes it so much easier.
I was getting a solid 170k xp a game and I had complete freedom, you need to spend about 30 seconds every 7 minutes. I played like 10 games in a row (1.7 Million XP

) as I just left it on and went somewhere else and checked every 7 minutes.
Just thought you'd like to know.