For autoflowers, would def check with someone who specializes in ruderalis derivatives... Ruderalis comes with so much genetic baggage IMO, I wouldn't be procreating with the genetics.
Reversing strains with sts is usually a really variable process. Sometimes you spray every other day for 5 weeks and no pollen or male parts. Sometimes you spray once a day before flipping, and she is dropping pollen 3 weeks later... Incredibly super super all the way strain dependent. For your first time going with this, which will likely be your last as most folks dont keep a clone going of their ruderalis derivatives (for many reasons), I'd give it like 2 weeks on the every three days. Also, IME folks try to literally spray when they get into reversing. That stuff is not stuff you want to spray. Mask/gloves/glasses, no airflow, qtip, nano-applications of this stuff where it actually needs to be...that is the way
source - have reversed plenty