It depends. None of the people I know at Jane Street work more than ~45 hours a week. I know a few people (mostly on the younger side) who grind out 60 hour weeks at Citadel Securities.

I think you'd find that, across the universe of technology-driven trading firms, work life balance is worse than tech on average. But you'd also see pretty high variance, which skews the mean quite a bit. Some firms are basically like top tech in terms of work life balance; others not so much.