Data
I have used 80% of my data on my iPhone 8. How much time do I have on the internet please?
iPhone 8, iOS 12
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No one here can answer that. Any data limits on your phone are between you and your cellphone provider.
So not only can we not tell how much data you've used, nor how much you have left, but we also don't know how much you're using on average on a daily basis, which would tell you how long you have before you reach your limit.
Fortunately, your phone will give you some of the details you need. Check Settings -> Cellular and look at the Cellular Data section. This will tell you how much data you've used, and which applications are using the most.