After a good cleaning mine usually will start producing in about 2 hours. makes alot of difference in the skimming ability of the 9010 when it's dirty versus clean.
one thing i've noticed to do when cleaning the cup is turn the skimmer off before removing the cup, if you dont, alot of times bubbles will get into the part where the screw goes in and do down into the airline when the pump pulls air, then it dries and seems to build up around where the airline connects to the bushing at the pump, and I'm sure it probably has an effect on the amount of air it can pull.