I'm sorry that I can't help you out on this timeframe, but just thought I drop a note and let you know first hand that I am well into veg. and the pest strips worked out very well. But, like you, I am about ready to flip the switch and need to know this same info. I was told that you can put the pest strips in for the first three days of bloom, but over and above that, I haven't read anything more.
Good luck and I will check back, too.