Why are the weekends longer?

I have noticed over the last few months that despite working one extra day (yes won't let Hubby forget that) the weekends actually seem so much longer. When I go back to work on a Monday I feel like I have been away for absolutely ages and ages. I am not aware that I enter some kind of black hole when I return home on Fridays or that my car transforms into a Tardis so why do I feel that way. I think it is down to chilling and not having to rush around doing things so the weekend starts as soon as I leave work. When we used to come down to the cottage a lot we would be packing up and then driving and so the weekend didn't really start until we arrived at the cottage at 10.30pm. We then had to leave at 1pm on the Sunday to see the rellies so that ate into the weekend too. Wierd really, but in a nice kind of way!