Sorry, but I don't know whether it'll be 7x, 10x, or higher so wouldn't be able to guess as to clearance rates/hour.

Bonuswhores.com has a chart (look under the Pokerroom review) that breaks down the clearance rates at different levels. It's a little optimistic on the low end tables, and probably a little pessimistic on the higher limit clearance rates.

Please note that Pokerroom tables at $3/6+ have lots of TAGs and Rocks, but very few truly loose players. Don't move up in limits just to clear the bonus, as this will cost you money.