So You Had a Bad 6 Hour Period of Time
People generally measure the quality of their experiences in days, rather than a more precise unit of time.
That is, they refer to having a good day, a bad day, the best day of their life, etc.
But almost no one says "Boy, that was a terrible span of 3 hours" or "Those were the best 75 minutes of my life." This is true even though the experiences they're referring to almost certainly didn't last a full 24 hours.
There are exceptions, of course. But I think the general tendency is interesting. Also it resulted in this great song.