Hey There Sporulater, That was a very nice gift whoever gifted you with those. Usually G13 crosses flower between 7-9 weeks depending on the cross. The G13 helps alot with the early flowering for example G13 x Haze is about 8-9 weeks where as pure haze flowers between 12-16 weeks. The AK47 is 53-63 days. I have a small collection of the G13 family myself. I went G13 crazy after I grew indica dominant G13 x haze from Seedsman.
Now, on how long to veg, I think this is where personal preference and patience comes in because even though there are some strains(not including auto-flowering) that you can go 12/12 as soon as they break dirt, now for me I always veg for 30 days no matter what. Usually people veg after 2 weeks.
I hope this helps you out.
