This thread's discussion is locked. If it doesn't give you the information you need, head to its forum board for active discussions or to start a new discussion.
Most (though not all) phones come charged around 1/2 - 2/3 to start. It's suggested to charge them up full when you first get them but it doesn't seem to have a major effect on them from what I can tell.
It depends on the phone, the charger you're using and what you have it connected to. Using the wall charger will get you the fastest charge (instead of charging using a computer through the usb cord)