The Linux portion wasn’t long at all, it’s just a matter of putting files on an SD and unpacking other files to a second SD with Linux, then it just boots. Probably about half an hour.
Installing HomeBrew Channel and BootMii is another story, I did that last year and don’t remember how long it takes. I can look for the guide I used and post it here when I find it. This part is also pretty straight forward, but I’m not sure if/how things have changed.
I would totally recommend it! It’s shockingly responsive and usable and the devs have a ton of packages compiled for it in the repos.
Here’s the website, I have nothing to do with this.