Hard to say as I fly a lot on various carriers and alliances, but I reckon around 250,000.
Roughly comprised of 70,000 with Star Alliance, 60,000 with Skyteam, 70,000 with oneworld, then I am guessing about 50,000 on non-aligned, LCCs, and a couple of award tickets. Sectors I would really struggle to accurately estimate.
I would love to have kept a record to see it all precisely, just like I'd love to give something back by reviewing every hotel I stay at on Tripadvisor.... but in reality I don't really have the time and would probably give up logging my flights after about a month.