sounds like it's working out well
I was going to say do it as long as you can reasonably tolerate it or until your kids start calling you 'Mister'. No kids, go for it.
when we had kids, my ex kind of went into a financial panic but we were totally fine. He changed his shift to nights so he could be with the kids during the day, constantly picked up overtime and I mean constantly, plus he tours in a band every few months. He did this until the kids were in late middle school. But his kids did not call him 'Mister' because when getting home at 7am, he was all theirs. He slept less than 4 hrs a day (except when he had a day off). Admirable, you are working hard for your family and at the same time you are fully present for them. But while great with them, he was a miserable SOB to be around. He had zero time to himself and that is not healthy. Years into our divorce I even said, quit working double time on the weekends you don't have the kids, get a GF, have a social life.
Divorce sent him into super panic about finances and he worked more. He has a hot shot lawyer that eggs him on to take me to court for stupid stuff. I would win, we've had the same judge for a decade, she has said enough with the nonsense suits, yet they continued. So ironically, he got so in debt to his lawyer and lived on CCs, that he had to declare bankruptcy. All that work, all those hours of life he will never get back, only to declare bankruptcy. He's quite a bit older than me to begin with but every time I see him, he looks worse, he's so thin, he has a grey pallor, his cheeks are sunken, he looks corpse-ish.
That's when you should stop- if anyone compares you to a corpse. Or seriously, when you can no longer make time for a social life, you're young, that's important.