I used to worke 70h/w, did that for a couple years, sometimes going up to 80 or 90h/w. 90h/w isn't tenable for more than a few weeks. 100h/w is bullshit unless you never buy groceries, shower, etc.

> So when people tell me they’re doing 90 hour work weeks what that tells me is they’re just harming themselves to be in an office for an unhealthy length of time, hoping it translates into something productive.

This is exactly what my colleagues thought. And then I left and everybody was distributed overtime work, so the leads left too. Projects that took 2 weeks suddenly took 6 months (or so told me the lead who was taking up my work, giggling out of shame). The company, which thought it could match competition with only 1/5th of human resources, started to do a series of bad investments to occupy the market. Eventually the board poured a couple dozen millions to save the company from the human resource dead-end it put itself into (I was managing 4 "microservices") and went bust a couple years later.

40h is already too much for me, 90h sounds insane