I haven't really grown any autoflowers, but shortest photoperiods I have grown include Raspberry Kush, Shishskaberry, Blackberry Kush, and Hashplant. I don't remeber exact times but some were in the region of 7 weeks or so to finish to my liking. I dont have space to grow pure Sativas so I don't have much experience with longest flowering strains. I have an Omega Dawg right now that looks like its going to take 75-80 days, but I have heard talk of old school hazes taking 14+ weeks.