Our company used to pay doubletime on Sunday, after it was abused(people would skip Saturday), they changed the policy to state that you earn doubletime on your seventh consecutive day worked.
Now recently we ran into a problem, several people had a day off one week, worked the weekend, then worked long days the following week.
For example, I had a Monday off, worked the rest of the week including the weekend. Come Monday, my seventh day, I sold the doubletime for the ten hours I worked.
Then we worked ten hours a day through Friday. So all together that week I worked fifty hours, but did not get time and a half for anything over forty.
I was told that because I had sold doubletime on Monday, that day does not count toward my forty hours worked. So I would have to worked over fifty hours to get overtime.