I've been running a "clocked" Roma for half the year (switching between the Roma and the Bonito) and have had no problem getting between 10-11 minutes runtime in the 8T 2.0
I'm using the Nova 9886 pipe and an M2Clutch system and #8 venturi. The gearing - 50T spur and 15T bell. The motor seems deceivingly slow cause it hits top speed so quickly but she's definately not lacking.