In message e.net, at
08:07:22 on Wed, 2 Jan 2008, Mark Goodge
remarked:
It never failed to amzae me how often one got pulled up for being ten
minutes late, and never rewarded by staying 2 hours after time.

Maybe you should have stopped being amazed, then.

Explained to me as "everyone sees you come in ten minutes late, no-one
sees you leave two hours late".
--
Roland Perry