iPhone 4S usage

That's an extremely variably-answered question. It all depends on what your usage entails, whether that's browsing, calling, messaging, streaming, the list goes on. It's much to variable to get even a decent trend. Sure, people can give you their own experience, but again, that's based on their usage, not your own.

 

Does it really matter?

 

iOS 5.0 and 5.0.1, it takes about ~5 minutes to drop 1% on my 4S, even when at 100%.

 

Is this question serious?

 

It gets as much usage as a user gets, when they use that usage of their iPhone.

 

to answer this question seriously, an equation must be figured and solved for X....
like 3min prob

 

Well why to call the question ridiculous, if you dont want to answer or dont know the answer just go ahead, no one is forcing to come here and reply, its really a simple question.
My 4S takes almost 3-5 min to drop from 100 to 99% battery. the later drop downs vary too much!