The work hours for a Unit Secretary vary. When I first started (a long time ago), I worked from 3pm-11pm, 5 days a week. Towards the end of my working there, they started phasing in 12 hours shifts (7am-7pm or 7pm-7am, 3 days a week).
A few Unit Secretaries worked 4 days a week (two 12 hour shifts and 2 8 hour shifts).
Today, I think most of the Unit Secretaries work three 12 hour shifts per week.
Put in the comments below what state you live in and what shift you work.