I saw a comment by an anonymous Meta engineer who said that it's difficult to leave when you see $2m worth of unvested stock sitting in your account. How many years would you be miserable for $2m? Many people can be easily seduced by that amount of money

Given it's like 30 years of my salary I'd probably be willing to be miserable for a number of years.

Totally understandable, and probably another reason why morale is so low, as employees watch the stock price and their personal fortunes fall.

I guess it depends - if the miserable conditions and work I was doing only affected me, maybe a couple of years. The problem here is that Meta is a company that actively does harm to the world. They've contributed to genocide in Myanmar, harmed children, and overall have been a net negative on society. So my answer to your question, if we're strictly talking about Meta, is none. I would never work for a company like Meta because I value other humans more than money.