Definitely not 9-5, M-F. Most billionaires inherited substantial wealth to begin with. But executives, in general, don’t have “hours” in the same way as rank and file workers. It’s more about knowledge and meetings — well, hopefully knowledge — so you might have an 11am meeting, a 2pm call, and then a 7pm dinner with a potential investor or whatever. You don’t really “work” in between those obligations unless it’s a small company (where you probably aren’t a billionaire anyway). At most, you need to make a board report or PowerPoint for a presentation or something like that.
Billionaires who just own things and aren’t in the C-suite don’t work much at all. Even if you’re on some boards, it’s not much in terms of actual obligations. There’s definitely tasks to do but it’s also definitely not a job. So, a bit like being a landlord.
I feel people still don't understand how much a billion is. One Million dollars would still be life changing for most people here, but consider that 1 million seconds ago was 11 days ago, 1 Billion seconds ago was 31 years ago.
To put it in another perspective, a very bad investment would yield you 0.1% monthly. This means that if a billionaire was to invest money the worst way possible, he would have to spend over 1 Million dollars per month to ever decrease his fortune.
If you had an infinite money machine, that as long as you don't spend more than a million per month it just keeps on growing, would you ever work? Yeah, thought so, billionaires are the same, they might have hobbies, and those hobbies might be something others consider work, but they're not working.
I personally believe that if a person ever gets 1 Billion dollars he should receive a letter congratulating them for winning capitalism, and informing them that any cent above 1 Billion will be taxed at 99.9999% (including investments).
Welcome to a day in the life of a billionaire. You'll need to get up nice and early for a personalised yoga routine devised by your trainer, and then it's straight out of the house to work. You've got breakfast scheduled with a CEO, and you're going to spend an hour objectifying women with him before heading into the office. Quick hello, report from your executive team, and now it's time for a power brunch with the man who sources child slaves for you to have sex with. Private jet flight to the next city over for lunch, you have a corrupt mayor to bribe so the minimum wage won't go up. Then it's time to fly back and spend an hour in your office looking important. You ended up sleeping with your secretary instead of getting anything done, but hey, we can't all be faithful to our wives. Now that it's 2pm, you've got to go play golf with your "professional contacts". You refer to your caddy with a racial slur. At 4pm, you go back to the office for the last time today, where your son is waiting for you. It's very hard educating a young man on how to inherit a fortune 500 company that runs itself. You spend most of the next hour telling him about golf. At 5pm, finally get in your limousine to go home. You've been working all day, and you're beat. You praise yourself for your work ethic, and wonder if the single day you work next week is going to be as hard.
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.
Typically there's an entourage that includes the people who actually run things and/or communicate the decisions made by the oligarch. They will own the company but rarely make direct decisions for the company. They may make business decisions in the beginning of the company history but by a certain size they are detached from most operations and hand down proactive choices about what the company should be doing with its resources.
The primary vehicle for their money is the control of the company they own, the actual stocks that they borrow against for spending money.
Since they have access to any amount of money they want, there is no need to do any actual work. Any interaction with the company is just personal preference and the owner is more useful as a mouthpiece and investment magnet for the company. With few obligations each week, days start to not matter and sleep schedules are fucked. Sobriety becomes a burden since there is nothing to live for - it has all been accomplished. The only thing left to do is get drunk/high and spend money.
Owning a successful company, even a successful local business, is usually enough to detach a person from the average experience of daily work and set schedules. Millionaire business owners are just as warped as a billionaire so it becomes a question of where the shit happened. Billionaires go overseas to do fucked shit.
Anecdotally, most millionaires don't work. Some have hobbies that make a few thousand here and there but they don't worry about schedules. They are on rich time.
Edit: the ones who are in business leadership and making millions each pay period are literally sociopaths. They run shit to exercise power. They don't actually need to be there either except for some decision making meetings and coordinating with other organizations.
I don’t know any billionaires but I knew some extremely wealthy people and they def worked for it. One only slept from 1-5am, we knew because of their email and document edit times. Also had to supply them with satellite internet while they hiked up to my Everest base camp so they could keep working. Dude was intense but literally built an empire in his industry by himself.
People that were already multi-millionaires at birth? No idea.