In theory. But in practice, the tradesman hours would be so underpaid compared to SWE hours that I'd either want back into SWE full-time or to have those hours completely free of work as personal & family time. The opportunity costs here don't work out. Spending time away from my family for less money is not a good deal.

Health is the opportunity cost otherwise, but it's hard to price health. And I don't mean that it's priceless; the price is ambiguous - is my health worth less or more than what half my salary buys me?

For software engineers, this is a difficult question to answer. If I were working an entry-level job, my health would be more valuable to me. If I were at the peak of professional development (a figurehead at a massive company or someone whose work changes the world), my work would be more important. SWE work makes a lot of money, but somewhere in the range of where I value my health.

How much $ a year is your health worth to you? Not a rhetorical question, would be interesting to see some answers if anyone can come up with a figure.