ohhhh shit, that kinda sounds bad, six weeks? if they are six weeks into flowering, depending on the strain, you might wanna force flower em if you are able...you must put black bags that light doesnt penetrate over them so they think the sun goes down earlier...cuz yeah it could suck if they are that far into flowering and then they reveg and you have a leafy crop...but I dont know the exact situation...like if you want them to finish or not, and do you mean they have buds and really LOOK like 6 weeks of flowering, or that its ben six weeks since you noticed them to flower? cuz if its just a bunch of hairs but not really bud, then let them reveg