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Let's say I am explaining a internet plan or a mobile carrier plan to my friend. I say
You don't have to pay for the whole month. You just have to pay for as many days you use it on.
I would like to know if the construction of the expression in bold above is correct?
Almost; you need another as:
You don't have to pay for the whole month. You just have to pay for as many days as you use it on.
But aside from that, this is exactly right. The meaning fits perfectly.
