2 weeks is for clone vegging...seed vegging 6-8 weeks from sprout to transition flush/flower phase. and don't shortcut the time, unless you don't care about yield.

Longer veg means longer flower to finish time and more yield, also more plant height.
If this is a consideration, then veg until plant is 12-18 inches high, because it will grow 2-3 times the height 24-42" approx. in flower-12/12...hope this helps