There is no separation of development and support. I would say the average work week is 40-45 hours if you stay focused but when rotating through primary support you are expected to be available 24/7 for the duration (1 - 2 weeks at a time). Not always a steady 9-5, some days a crisis hits and it can be closer to a 24 hour day even though the week still balances to around the low 40 hrs a week.