2 to 3 seconds to get your foot fully off the clutch from a standstill is fine. I think people underestimate how long it actually takes to do it smoothly.
The question is, how many revs are you using to start? On flat ground, you can crawl away at just the idle speed. I usually use about 1000rpm to get going from a standstill. The more revs you use, the quicker you'll wear out your clutch.
I would recommend going to a flat parking lot and practice standstill starts without using the accelerator.