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There isn't one type. There are the ones like Bezos and Dell, who got rich by growing one or more businesses, and are still at it. They likely don't work normal hours, but they likely work more than 40. Some of those, like Gates, get older and move on to other things like foundation work, but not an actual job. Hard to say what kind of hours they work. Then there are the ones like Christy Walton, who inherited their wealth and don't really ever work.
Best/most honest answer here.
It's ridiculous to assume they don't work. They don't have to but I bet most if not all of the billionaires that didn't just inherit their fortune are total workaholics.
Yeah, that's mostly the case. There's a lot of people here just making a lot of assumptions, but there's quite a bit of information on billionaires as individuals. For instance, there's this Forbes list, where you can click each one to get a summary of how they got rich.