Depends on the settings in the control panel/ power options.
If everything is maxed out 45 min to an hour is it.
If you tweak it you can get up to 2 hours if it is the heavy duty 4000-4400.
4-HOURS, HOW'S THAT....IN STANDBY MODE?
LINK
Battery, Primary
Lithium Ion 44.4 W 4000 mAh 6-cell battery pack:
up to 2-hour battery life
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When I purchased the computer I was likely a victim of false advertising because on Shop NBC they were bragging that it came with a batery that lasted 4 hours. Buyer Beware.
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