The longest I've ever billed a client continuously was for 48 hours straight. Also one of the least important jobs: a fancy county club had hired a company to do the Christmas decorations, which included a Christmas themed model train under some stairs on the bottom floor. The subcontractor that was supposed to do the model train set screwed up somehow without finishing the lighting.

So I made some fancy microprocessor controlled lights for this model train set, finishing about an hour before the deadline imposed by the contract.

Apparently the country club was threatening to use that failure to reneg on the overall $250k contract for the Christmas decorations. 😂😂😂