Wow. It's early, but I'm thinking. The best number I can come up w/is 5-6. I remember in WWF/E the 1st one from beating the Iron Sheik, 2nd one taking it back from Slaughter, and the one from Yokozuna. I know he held the WCW belt, but not sure the number of times it was lost and gained back. Thinking 2 or 3 maybe. Plus, don't remember for the life of me if he had the AWA belt at one point, but I'm thinking not. So that's my guess, 5 or 6.
Edit: After going through and reading, my not caring for Hogan is obvious. If I'm off by that much, it's a sure sign I've tuned him out for quite some time. And I don't even feel disappointed.