Yeah, I think there's definitely an ideal balance, and I don't think consistent 70+ hour weeks is the right balance for anyone. If my work schedule is busy, but near 40 hours/week, burnout is probably not a major worry. Occasional weeks that demand more than 40 hours are manageable as long as they're balanced out by easy weeks or vacation time.
I've been really struggling with my current job because my actual workload is closer to 15-20 hours/week most weeks. I end up having a ton of trouble getting started, and am always late on things. I've tried on multiple occasions to tell my manager that I actually need more work, but they instead keep suggesting that I learn to delegate things more.
I hope you're doing alright now. I know moving can be extremely stressful, and hopefully your recovery time is enjoyable.
I remember once in college that I had a big paper to write, and I decided that I was going to get started on it "early" so that I could finish it early and avoid the deadline stress. I legitimately started it early, but somehow still managed to finish it at the very last minute. I spent my entire weekend in the library, and I don't think the final product was significantly better than if I had procrastinated on starting. I just spent a lot more time on the research part of it, and didn't really start putting anything together until the deadline stress kicked in.
Since that experience, I find it even more difficult to convince myself to start things early, since I'm afraid it will just mean spending more time on stressful tasks.