depends on the strain's flowering time...that ranges from on average 40 to 65 flowering days. If your growing outside that could be a problem because with your time limit you may have to force flowering..which the main con about that it you won't have as big of a yield at the end because they did not have a long enough vegative state. In my case, I will pull most of the males as soon as I see them because I don'tlike seedy bud, They can start the pollinating before and right into flowering, if you have a male by your giirls, which odds are that you will unless you get damn ass lucky and allof your plans turn out to be girls. Just the let man do his job and you will notice as your drying curing and cutting your ladies they will have produced seeds.