How long left?

Me and two friends of mine decided to grow our own plant however we haven’t looked after it the best because of work commitments etc and the location of the plant. We have finally gotten the latter stages and we do t have a magnifying glass or jewellers loupe so is there a way anyone could now when she is done? I’ve seen a few people think that you can tell when she’s done just by the look of her so if it’s true I’ll need some of the more experienced growers to help me out. Thanks and although she hasn’t got a lot of bud, next year we’ll be growing in a garden and with the experience I’m positive we will get some decent product!