I'm sure that most of us (as developers) spend a lot of time on Visual Studio for a day. Sometimes get bored, dizzying about our project :)
Me, I usually start open-up VS about 8.30 till 18.00 (9.5 hours - 1 rest time = 8.5 hours)
If I have schedule to teach at binus center, then of course I will start visual studio again,
18.00-21.00 (3 hours)
If I don't have schedule to teach, I will continue my freelance project about 2 or 3 hours a day.
So regularly, I spend about 11.5 or 12 hours a day on Visual Studio. Maybe SQL Server is also :)
How about you? I m sure, maybe some of you spend more than me.
Maybe we are all familiar with web development. HTML, Javascript, CSS have been used for decades. But have you use it correctly? I myself not really 
. So, we as the web developer must know the web development semantic well.
Here's indeed good resources for learning CSS and web standard design.
http://www.westciv.com/