what life lesson? this is akin to a boss saying 'i need you to work 40 hours' and someone working M-Th 10 hour days and the boss saying ' i'll still need you to come in on friday
sorry boss, i did my time
More akin to your boss asking you to put together 5 proposals for a job bid and you putting together 4 and blatantly half-assing the 5th. Technically you didn't really need 5, but you were asked for 5 and you blew it off.