It's possible to get to a stage eventually where you're making money daily without needing to put in a full working day every day (e.g. selling a SaaS/app/ebook

It's possible to get to a stage eventually where you're making money daily without needing to put in a full working day every day (e.g. selling a SaaS/app/ebook, consultancy retainers), but that's not likely to happen without many hours invested beforehand somewhere. I'm guessing it's extremely rare you can create + sell something with minimal hours invested with little specialised experience though. I agree though, I think you're always going to have some level of ongoing responsibility as well e.g. responding to customers/clients, keeping an eye on server issues, checking up on contractors, marketing.