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#101
It's not really put into minutes of usage.
For example, your internet provider probably limits your internet usage to some many gigabytes per month. Unless you have unlimited, which is really nice to have. Anyway, cellular data is the same, except it's normally considerably less. highest is normally 4 GB, but most people just get unlimited it they need a lot of data. I however, get 500 MB a month, except this month FreedomPop gave me an extra 200 MB for signing up with them so I had 700 MB for this month.
Basically when it comes to data usage, downloading or streaming are what's gonna eat up your data the fastest. Streaming is the worst. Browsing the web on the other hand requires much less data.
Here's a little calculator you can use to calculate your monthly data usage. Estimate Your Web Usage | Data Usage Calculator