Yes.2 different ones. I replaced 2 EE, 2 C++ and 4 Java programmers at one startup. 8 AM to midnight M-Sat. Just 6 hours on Sun so I could wash my clothes and put a few rounds downrange.
The other startup was an internet payment provider. 14 hour days, 6 days a week. I had 38,000 options at 9 cents. I was nearly a cripple unable to open doors, shift my car or pick up a glass of water. I had to walk away from over a year of grueling effort. After I left, the stock soared to $26/share at IPO. Sad story, but I left still functional and ended up with an annual salary 4x where I started. The salary bump was more valuable than the IPO.
After my first start up I always asked for money not stock. Told em if we did well I’d buy the stock legit
The hours you discribe are typical. Kind of like living at the job site