Don't know if this is correct, but when starting cold I typically spend about 30-60 seconds, in neutral revving lightly, as it helps to spread the heat more evenly. Then when I take off I try to stay out of the band and avoid heavy engine loads for a few minutes, then I just ride normally, except I try to avoid long full throttle runs at least until I have been in and out of the power several times.
It may be overkill ,as I have read that for aircooled engines, a 60 second warmup should be enough to prevent a cold-seizure. But i figure there's not reason not to spend 5 minutes or so letting it warm up gradually it certainly won't hurt it.