meh to most. I've never covered a plant and everyone I've grown with has never covered an outdoor plant. We've always looked for seeds that had a maturation period of no more than 150 days though. And I've never grown one in a bucket either so there is that.
Never doing that before has me at a disadvantage here. I gladly bow to your experience here.

If he's working with genetics that is not conducive to his climate, your way would be the only way to make this work. I wouldn't know what to do with it.
Which is what I mean by genetics. If the plant is accustomed to the climate, the natural clock is all that is needed. If the genetics are like from Columbia, they may be worthless in his climate.
But today, almost everyone is growing green bud from Northern climate and trying to reduce plant maturity time. Like the mephisto and that LSD25, those are 90 day seeds. I started with 18 hours and like the book says, reduce light down to 12 hours. They only grew to a height of about 3 feet though.
My outdoor plants...those are now starting to bud already and today we hit exactly 14 hours sun up to sun down. The outdoor plants will continue to mature through Mid October. Some will be ready by mid September, some will stretch it out to mid October. And the better plants will grow to a height of 10 feet and produce a shit load more quantity than the 90 day plants.