Hey Growmie,
Unfortunately, Most seed banks are off by at least two weeks when it comes to estimated harvest times, so if they said 10-11 weeks it's going to more like 13-14 weeks, so with that being said I would wait to flush in week 14 to make sure the plant is mature enough, so your more than likely be harvesting in week 15-16 depending on how long you flush. Hopefully, I answered your question and remember ..."Happy Growing" and "Free your mind one puff at a time".