Laptop Battery Question

Microprocessor 2.4GHz/1.5GHz VISION A8 Technology from AMD with AMD Quad-Core A8-3500M Accelerated Processor
Microprocessor Cache 4MB L2 Cache
Memory 8GB DDR3 SDRAM (2 DIMM)
Video Graphics AMD Radeon HD 6620G Discrete-Class Graphics
Video Memory Up to 4085MB
Hard Drive 640GB 5400RPM)
isplay 15.6" diagonal High-Definition BrightView LED Display (1366 x 768)
Network Card 10/100/1000 Gigabit Ethernet LAN
Wireless Connectivity
802.11b/g/n WLAN

Power
65W AC adapter
6-cell 55WHr lithium-ion battery



For this laptop how long do you think the battery would last under webbrowsing?