How long is a while I was thinking maybe 3-4 weeks. I know how to check the tricomes and just so you know I’m using an HP4s commercial led light Ran me about 2800.00.
Like Lordhooha said, give them time and be patient. They look healthy, that's all that matters when you are new to growing.
There is a lot of emotion about LED lighting on this site.
Your post is likely to change the conversation from your plant to your light.
$2800 is a lot of money for a 330 watt light.
One of the companies selling it is American led company and they are getting some heat in the LED section for a majestic light of some kind they are trying to push.
I'm not taking any position on it I'm just giving you a heads up so you are not caught off guard if things get ugly.
Happy Growing!