For double the pay, I'd work overtime to get something done - if I like it. I used to work 50-60 hour weeks with no overtime pay (yes, yes, I was exploited). Had I been paid overtime and at double the rate, it would've pushed my annual salary to 1.5-2x . But my guess is that either the manager would've been fired for being shit, I would've been fired for costing too much, or they would've simply hired another engineer to join the team (we did need more engineers).

Just need to pump those numbers up. Pay me $2000/hr and I'll work 12 hour shifts. Pay me $4000/hr and I'll work 24 hour shifts. $10k/hour and you'll have me doing a 60 hour work day.

Don't ask how it happens. Just trust me and pay me six months upfront.