depend on the strain..

if you have a haze like JH, neville's it'll take about 10-12 weeks. If you have NLX , PP or an afgan i'll take about 9-10 weeks. I'm not familiar with the strains in america that much so I wouldn't know it with all the species. If you know the percentage of sative/indica I can give you a flowering time wotherwise not.