Due to working in an investment bank with branches all around the world and working to different time zones, you could be in meetings or working on projects that took lengthy periods to complete.
Shifts were 07:00 -15:00 and 15:00-23:00.
I found this convenient for my personal circumstances.
Getting in the building is easy its getting out that's the difficult bit.
12 hours a day with no break's
you have to creep outside for a toilet visit
Industry standard - 9am - 6pm