When I wasn't using a flushing solution, I did one and two weeks.. the two weeks burned perfect, but the one week had some residuals in the bowl, but I couldn't really taste a difference.. even though I told myself I could.but like faller said, he's done both with out seeing any difference.
I dunno.. Had snags on #1 and #2. We'll have to see at the end of this flower, but I'm told it is. Plus you still keep giving other nutrients at the same time as to not stress the plant or harm yield in it's last weeks..so does useing a flushing salution for 1 week do what flushing just with water does in 2 weeks?