It's pretty good, normally it's 9 to 5. But normally I stay around a bit later [5:30 - 6:00PM] to tie some loose ends.
Working hours are pretty flexible based on what period you are in, there are quiet periods where you self study, which you don't have to sit in the office for full 8 hours, but when projects get busy it's likely you will have work to bring home to work on.
When on a case the hours can vary depending on the time-zones, however, this usually sticks to the normal 9-5.
Standard 40 hour work week. Quite flexible with arrangements for appointments/WFH due to sickness.