Latest a plant can be pollinated

[D.W.FAAMER]

Ok green house lemon skunk. Both of the pheno's i had in flower bore seeds.Not alot but a few.Well i have 2 sweet wonder woman fems in flower 4 weeks today.here's the problem. I have been vegging another lemon skunk.A dedicated veg!Like a baby redwood,lol.Hey they bear seeds but the herb is outstanding,i'm crying man.Question if i wait til my wonder woman's are 6 or 7 weeks into flower and slide that lemon into my flower room to get busy,will that be too late in flower period for my wonder twins to get knocked up? These two girls are my pride and joy,huge kola's for 4 weeks of 12/12,i do want to see if nirvana's w.woman is true fem.Or should i just wait til they are done to flower the lemon?Wonder woman is supposed to finish in around 8 weeks.When exactly do females quit being receptive to pollen?

thanx!