The drug-fueled, several hours long masturbation sessions by a male partner are not unfamiliar to me. I dealt with this for likely 5-6 months, as I recall.
He’d lost his job, which had taken him out of town each week from Sunday night - Friday midday. I’m not sure how much, or whether he was engaging in this fun when he was out of town at the hotel he stayed in during his workweek. I do know he couldn’t have been spending the same amount of time, nor half of it, loving on himself while still employed. I suspect he wasn’t hitting the drugs too hard while he still had his job because he had to be on top of his game.
His drug taking really ramped up once he lost his job, (for knocking out a construction foreman at the jobsite

; he’s so totes a dumbfuck!) A day after being fired, he was then home 24/7. I’m not certain he was doing meth, though in hindsight, I suspect so. I know he was doing lots of blow. His other drugs were anabolic steroids, which he took in copious amounts. He was in a chronically bad mood, too. He was carrying on 3 concurrent affairs, which was made easier as they each lived in different cities. His body was changing radically, and rapidly, and he got super big arms and thighs, even kind of a big ass, but I digress.
I was off work at this time, due to a long recovery after kidney surgery, and I witnessed his daily porn indulgence + limitless whack off sessions. As much as I know about male sexual health and activity, frequency and duration of masturbation is not a topic I know much about.
After my daughter was off to school, he was off to the races each morning. I was usually still in bed (this was about 7:30am). He would hop on our bedroom desktop computer (I imagine he preferred it due to its large monitor) which faced me. I always pretended to be asleep because, mostly the porn genres he fancied thoroughly disgusted me. I’m not a frigid girl, either. And, god forbid, if he got really worked up, I didn’t want to be asked to service him.
Anyway, other than bathroom breaks, stops for drinks, and likely breaks for the replenishment of steroids, blow and whatever else was on the daily drug menu, he kept going until my daughter arrived home, usually 3:30pm or so. If she called and wanted to hang out with a friend and perhaps have dinner with them, he’d keep it going on until she got home.
So, with the little bathroom and kitchen breaks, he could keep going over 12 hours some days. I noticed that he was almost always 100% flaccid, since morning wood was more like 3:00am. I never observed him using any sort of lotion or lube, and 100% of the time he never came. This makes me think he just enjoyed doing this for the sake of doing it, and wasn’t anticipating any end reward. At night before bed, I often saw him apply Neosporin - an antibiotic cream that aids in the healing of cuts, burns, etc., in addition to a bandage. I don’t know if that Neosporin worked overnight wonders, or the urge to self-fondle was just too great to ignore, because invariably he’d be back at it the next morning, so long as it was a weekday.
I’m certain these sessions were drug fueled and I imagine the blow could’ve provided a degree of pain management perhaps. Without drugs, I have no way to explain his behavior, since it happened at least 4/5 days of the school/work week.