Time just vanishes

So, I had a (mental) list of things I was planning on doing tonight, and it's now 8 minutes past bedtime and 0 of them have gotten done.  Where did the time go?  I think it somehow vanished between wrangling a kitten and spontaneous litter box cleaning.  I don't know why I ever thought 5 minutes seemed like forever when I was a little girl.  My kids are getting grounded for 2 hours minimum; it still is over before it starts.