In a 3 gallon they almost always flower in a month for me.
I use 5 gallon only now. The difference is size. They get much larger in 5 gallons. My current nlxbb is now 62ish days old and no pom yet although she is moving fast and should pom out by the 15th.
Things vary of course but I'm lucky to get a foot and a half of no stretch in a 3 gallon. In 5s all my plants are 3 foot +
If only I could run HPS.. I'd be in heaven.
Don't think I've even read the month per gallon thing before but it sounds about right cause I'm not expecting her to finish till October.
I did a pot test this time too I have a 5 gall plant warrior poot a 5 gallon root pouch and just a plain Jane black 5 gall pot and all are about the same.
I am coming to the conclusion that I dislike root pouches though. They cause clumping and hard spots seems to slow roots.
Wanna try an air pot just don't feel like paying 25 bucks for a pot. I have great results with plant warrior pots tho.