1. I use it about 6 hours per day, can reach up to 10 hours or
more on weekends.
2. Depends on what you do on your laptop. If you are doing tough
multimedia work like 3D designing or video editing, its good to let
it rest for a short while after every 3 hours or so. Actually
laptops are tougher than you think and it'll run pretty smoothly as
long as there is good ventilation or if you use it in an
air-conditioned room. No worries here.
3. Nope laptops generally do not consume as much as desktops.
Unless you are talking about the 19 inch giant desktop replacement
laptop from taiwan.
4. Don't block its ventilation holes. Use it in a cooling area with
good air circulation, preferably air-conditioned. Try not to block
the base by putting your laptop on the bed too much or soft
surfaces, since heat escapes from the bottom as well
