Never had a strain not show sex by week @4. XXXskunk showed in 16 days from seed. I use a 7x eyelupe and have grown 50+ strains. Anyway, that's my experience and as for number of plants it's all in how long you veg. There would be no way for me to put one more plant in my grow. I don't see more than 4 plants under a 400 unless we are talking clones or very short veg/small plants. I finish my c99 at @week seven, while other strains go longer, because that's the type of high i'm looking for with C99. Everyone's grows and experiences within are going to be slightly different, as in why others sex later than me might be due to lighting during veg? I go 19/5 and I promise it's showing sex by week 4 everytime! C99 week 3!! :stoned: