Longest flight you've been on?

[MRS DONNA SHALALA]

I regularly fly the EWR -> CPT and the LHR -> CPT route, which clock in at 14 and 12 hours respectively.

I'm used to them, so I fly economy, catch up on some reading, and usually get a solid 7 hours or so of sleep. I've flown the route business before (free upgrade) and it's just not worth the increase in price IMO.