I’m a computer programmer, Normally I leave the office at about 7:30 and get home around 9:10 (Depending on the bus) however there have been times I have had to stay later. I think its only been past midnight 3 or 4 times in the 3 years I have been at my company, but 9:00 or 9:30 is not that strange.
Its called having a job and sometimes you have to work extra to hit a deadline or fix something. I do make sure to call my wife when I am going to be home late.