To whoever reads this: the code here is quick-n-dirty. It was written for my personal use and published here because some people expressed their interest in it.
It asks a couple of questions and then calculates and spits out some info like how many workable hours in a year, how many to meet your target and how much potential extra earnings you can have.
The logic is fairly generic so I thought I'd publish it for others to use if they can.
Disclaimer: YMMV, No guarantees, rough code
GOOS=windows GOARCH=amd64 go build -o bin/hours.exe main.go
GOOS=darwin GOARCH=amd64 go build -o bin/hours-mac-x86 main.go
GOOS=darwin GOARCH=arm64 go build -o bin/hours-mac-arm main.go
GOOS=linux GOARCH=amd64 go build -o bin/hours-linux main.go