I always keg hop, have 3" diameter stainless steel mesh 'tea balls' I fill with Citra to dry hop my Pale ale. They fit about 1/2 oz each, usually use 4-6 balls for 2 or 3 oz whole flower hops per keg.
I generally give it a week-ish at room temp, then stuff it in the keg fridge to serve, hops...