Now it is only once, at most twice a day, I am 50+. In my youth under special circumstances I've cum many more times in a day, especially if fire on my butt was involved. On one very memorable occasion when I was very young I didn't seem to loose my hard on despite multiple ejaculations, at least 5 or 6 times over a few hours. This was a result of serious "Fireplay", getting my butt, cock and balls, tormented by candles and pinecone torches during a "pioneer" camping outing with only teens, no adult supervision.
Finally in a scene that could have come right out of "Lord of the Flies" my "Friends" decided that the only way to control my raging dick was to actually burn me at the stake. They raised a stake and told me to hump it while they burnt me to death. I obligied, wraping myself against against the stake pressing my raging swollen cock against it. "My Friends" tied my legs at the knees around the stake and my hands over a branch high on it. Then the real fun started, they built a fire under and behind my bare butt. I was already spent from cumming so often that despite my rock hard cock release wasn't easy "cumming". "My Friends" almost without exception had dropped their shorts and were wanking as my butt burnt, they were getting a good show as I writhed and screamed. Finally I started to cum, and I came hard, the most intense organsim of my life. My butt was starting to blister from the fire and I was shooting and shooting, totally greasing the stake with my cum. The show over, "My Friends" doused the fire and cut me down. I jumped into the icey stream beside or camp site to cool off my blistered butt. My rasished cock pulled a quick retreat. Part of me wished they had finished the job, burning me to ashes and dust.
I've had similar but not as exteme events like the above, cumming multiple times, 4+, including a "re-inactment" of the above at a wilderness cabin a few years ago with one of my "Friends". I came several times that weekend, usually against a stake while my butt was gently roasted over an open fire. For me nothing gets me going quicker than envsioning myself getting burnt at the stake nude, except actually getting tied to a stake with a fire lit under my butt.