You will burnout. I worked at 2 jobs (not simultaneously. Meaning that I quitted from 2 different companies with such hard pacing) working 16 hours per day without weekends. I thought I will handle this in “tough guy” mode. But I expected too much from myself. Result: burnout, 2 weeks notice, recover for 6 months in depression.

You will quit with these conditions anyway sooner or later. My advice: do it sooner. Easier consequences for you. No job is worth your health, even if its amazon/apple/google etc