6-cell laptop battery, I think almost 3-4 hours. My replacement ACER BATCL50L battery can last 3-4 hours if it is fully charged. 14.8V, 4400mAh, Li-ion, 6-cell laptop battery.
It really depends on the specification of your laptop.
6 cell for a net book is a huge capacity.
But for desktop alternative ones, that will be even not enough for one hour.
Try to compare at the link I provided below, you'll probably find what you need.
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A six-volt battery would not boot the computer. We suspect that you mean a six-cell battery.
In any case, the battery life of a computer depends on the processor, the drives, the temperature (how much the fan runs), the age and condition of the battery, how many programs are running, and a variety of other variables including the kind of work being done. In theory, you could assume a roughly 50% increase over a 4-cell battery, but in practice it would probably be somewhat less.