5 hour levels is ~300k/hour or more at 70+ as levels are in excess of 1.5m XP.

The thing about AV tho isn't so much the speed, more the convenience. Tho i've seen 700+k/hr on winning streaks. Problem is, it's possible to get 0 XP if your team really fails. So I find myself going /afk and waiting out the 15 minute debuff when it looks a 50 min AV fighting at the choke points is inevitable.