Timewise, I have many days at which I dont work at all.. usually these days come in bundles.
There are other times at which I cant stop working on a certain piece, but those are seldom and usually very tiresome.
A normal day of work would consist of me getting home from work at about 6pm.. making dindins and starting to work on the computer at 7pm.. usually just playing stuff and answering messages.. then I might end up working on some project for about 1 or 2 hours.
On weekends and when one catches me in an extremely horny mood I managed to work on a single project for up to 16 hours a day. I used to make the T-Rex head:

a long time ago. Took me about 4 days with 4 hours work a day. And that was just modeling it.
The first animation of it talking for about 10 seconds took about 4 hours.. but I got a lot faster later on.
this one:

took me a single day.. about 8 hours, but I was testing it out with ZBrush.. so that took about half of the time without helping the looks much at all. (complete with texture, rigging, posing an lighting)
Now animating those naughty animations .. I cant really say.. I usually start at some horny afternoon and dont stop until I... "stop being horny" which can take anything from 30 minutes to 5 hours.. I cant recommend 5 hours though because they make me kinda sore.
The "RapPush" animation took about 3 hours.. but that was easy because it was just basically two extreme positions and some facial movement.
"Rex Inside" I cant even say it took any time at all.. I did animate the T-Rex Head moving about .. took about 20 minutes a long time ago.. then I found out it looked rather fun from the inside and changed the camera persepctive.. took about 2 minutes.. but the computer spend about 6 hours of rendering while I was at work.
I'd say the "Tailhole vs Human" took me about 1 hour of animation. (creating the tail not included)
There is a reason why I love "simple loops" I can play them for hours.. but it only takes a minimal amount of time to animate and render. Not to mention I don't like to put an end to anything.