How often should I be charging macbook?

I just got my macbook for college yesterday and I have had it charging constantly since I have not left the house with it. (I don't leave for college till next friday).
Is it bad to have it plugged into the wall at all times or should I let it die then charge it and repeat?
I just don't want to burn out the battery or anything.
Thanks.

It can be connected to the charger forever. The charging circuit shuts down automatically once the battery is fully charged. Recharging will not occur until the charge level drops below 95%.
The battery will not "burn out" but it does have a finite life of roughly 500 full discharge-recharge cycles. Use System Profiler and select Power to keep track of the number of charge cycles and overall battery condition.
About Batteries in Modern Apple Laptops
Apple - Batteries - Notebooks
Extending the Life of Your Laptop Battery
Apple - Batteries
Determining Battery Cycle Count
Calibrating your computer's battery for best performance
Battery University

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