I started at 13, and I am now 57. I would dare say about 1000 (no exaggeration here). I live in Toronto Ontario Canada, and frequent the gay district. I have also spent time in Vegas (about twice a year) and Los Angeles. I always go to ABS and have Craigslist posts (now Doublelist). Hard to say how many were repeat cocks in glory holes or ABS of course.
But I have been openly bi since the age of 16. I have held parties where I blew upwards of 15 guys. I have been to orgies and sucked off 10 or more guys a night. I have also been to ABS and sucked probably 25 guys in a night.
I figure 44 years, some times busier than others (younger and hotter made it easy to blow guys). I think averaging one new guy a week would put me over a thousand...and except for a time I was down after surgery for 3 weeks), there has never been a week I did not suck cock.