Depends. Primary outbreaks usually last 10-14 days. Recurring outbreaks can last only a few days to a little over a week. That's ballpark
Can a outbreak last month or two
Ok last question. Do a person breakout where the exposure happened or it can breakout anywhere on the body? Example like received fellatio and breakout on your butt or back or stomach?
The primary outbreak that happens usually 3-10 days after exposure will happen at the place the infection entered. The penis shaft in your case.
Reoccurring outbreaks can happen anywhere in that nerve ganglia. For a genital infection this means the boxer shorts area. Not the stomach or back.