I have a small pile of SaaS products [1] that combine to bring in the equivalent of a nice Senior Dev salary (though far less than I would actually bring in were I to take a full time gig in the Bay Area).

I did a "passivity test" recently where I essentially took October off, just to make sure I still could. I'd do a morning email spin, then shut down and go bouldering or just play with the kids all day, averaging just shy of two hour weeks. Monthly Recurring Revenue grew on its normal path.

This month, I'm back working 6 hour days, 4 days a week, building the thing that will take up the slack [2] once those other products plateau. Fortunately, it's been raining a lot, or I might still be out climbing every day.

I'll reitorate once again that as a software developer, you absolutely should build one o' these SaaS things. It'll change your life.

[1] https://www.s3stat.com & http://www.twiddla.com [2] https://unwaffle.com