As a road driver, I was laid-off 2 times in my first 2 years(5 months each time) and I signed up for road, city, dock. I never worked the city or dock, but I was called for city the very first day of lay-off and did not answer. No warning letters. I believe it goes this way: If you take workcall and work, then you owe the company 5 punches total or the end of the H/W week comes and you start over with no obligations. If H/W week starts monday at 00:00 and ends at sunday00:00 that is the only period you are obligated to give them their punches. If they call you for work saturday and work past midnight into sunday, I believe you do NOT have an obligation to them until you punch in during the next H/W week. I hope this helps , and I'm correct, if not someone will correct me. I was using the H/W period as an assumption to make a point ,it may start and end at different times than I have shown.