OK, *Now* I Can't Get Extra Money

I keep saying that I can't get OT from work, but it feels as though my boss really means it this time.  Following up on a meeting we all had, he emailed me Friday afternoon saying that the work is light enough whereby overtime is no longer necessary, should I should leave work for the next day.  I disagree; I think there is enough work that, if I stay only eight hours, there will be so much carryover work that the next day's work will have to be pushed back, and that will create a cascading effect that will mean tests won't get done for a day or more.  The workload ain't that light.  It might not even be light, period.

But I reckon that he saw me go over eight hours last week, capped off with me staying until 6 Thursday night.  He has said that OT is off the table off and on for a few years now, but something about this email makes me think he really, really means it this time.  Fine.  I will acquiesce.  But he did say "try to leave after eight hours," and even though I read that Friday afternoon, it still took me an extra half-hour to do all the things I felt I needed to do before I left on Friday.  I will try and start hewing to eight hours beginning on Monday, which also is the start of a new pay period.  It's a clean slate that I agree to.  Maybe.