The last time was 2012. 6:30 am to between 11:00 pm-2:00 am M-TH. Friday was usually half day. Weekends occasionally. M-TH was at a client site in San Francisco from October 2011 through December 2011. Around mid October 2012, things slowed down and I left the office at 4 pm. As I rode the same streetcar I always took back to the hotel, I realized I had never seen things in daylight. Sad.
The other time was 1997. That was the second most hours ever worked in a calendar year for that 40 year old software company (3000 employees). First was my boss that same year. Not bragging. I feel incredibly gullible and sad thinking about it.