When I was 22 and horny all the time I tried an abstinence run because I was having trouble muscling up; I was the proverbial strong kid who worked out but was still skinny as fuck. I had this batshit crazy idea that not cumming would somehow boost my testosterone.
Anyhow I managed 28 days. I don't know how the fuck I achieved that but it made me moody and aggressive and the heroic spunk geyser I errupted when I broke the spell was not worth the emotional rollercoaster that I'd been on for 4 weeks.
I'd been doing a workout, because I was in my bedroom I was naked, because I was naked and frustrated I was randy and because it was a weights day I was randy as fuck! I could have probably shagged a hole in the ground. I'd just finished bench presses. Benching gets my cock leaking and my balls tingling and I just snapped. I put the barbell back on the rack and thought; "I've had enough I wanna wank". I think my plan had been to go a whole calendar month, so 31 days but my body and above all my mind was screaming for a sex act, just to relax me and calm me down.
I reached out and grabbed a copy of either FHM or Loaded, with my dick already twitching higher and higher everytime my heart beat. I opened it at a photo of a girl band, Mis-teeq perhaps, someone like that. It was a photo shoot of four girls in bikinis in the sea and they had gold body paint on their navals.
I lay back on my weights bench, grabbed my aching cock and lasted exactly 10 strokes before I had the closest orgasm I've ever had to my dong exploding. I splooged big time and it went on and on and on. I reckon I was spunking off for a minute at least. It's the only time I've had an orgasm for longer than I'd been stroking. The first volley hit my cheek and left a rope of jizm from my collar bone all the way down to my cock. Each spunkout after reached slightly less far, leaving tracers down the middle of my pecs and abs. Gradually the thickness of my baby-maker thinned out becoming more watery but the cock blasting wouldn't stop. My jizz was running down the sides of my abs and pooling under my back, I remember thinking; "Fuck, there's literally rivulets of cum pouring off me!" I guess spermjuice had given way to prostatic fluid, there's no way my twin "Badboys" could have stored that much sex fluid but I didn't care, I was back in my happy place.
So dunno how much splooge, I'd guess a bit less than 1/2 pint, but 60 seconds spunking from less than 10 seconds wanking is pretty good stuff.