How long should I germinate seeds for?

I plan on planting next week, 10 Northern Lights seeds, 5 Big bud seeds, and 5 Summer time Buddah. Last frost is this week for me. I am using 3/4 organic potting soil. And 1/4 purlite and worm castings. The site is outdoor surrounded by trees. About 13 hours of light a day. (Southern Canada). I have ben researching on how much to feed/fertilize/water all that. I just am wondering the best way to Germinate them before I plant them rate in the ground, and can they drown if I leave them to long, or should I do them the day before?
 
Top