From Neil Spalding's web site, wise words ...
With a Ducati quattrovalvole, especially after it has sat around for a while, oil can take up to 90 seconds to arrive. The Ducati oil delivery system has no one-way valve so as the bike sits unused the oil retreats slowly to the sump. When you start the engine the oil has to come all the way back up the long oil lines, it is not going to get there appreciably quicker if you rev it. The cams will not notice any difference if you are sitting 'off load' or are trying to ride it; but you do have some choices that will make life easier for the valve gear.
The first choice is the number of revs the engine suffers while the rockers wait for their oil supply. The engine can tick over at 1,200 RPM and bash the rocker surface 900 times in 90 seconds while the oil comes up. Or you can run it at 4,000 RPM; and the rockers will get bashed 3,000 times, it doesn't take a rocket scientist to work out that the cam follower is going to prefer the lesser of the two evils. http://www.sigmaperformance.com/rockers.html