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That will depend on the numbers of applications, downloads, browsing, video streaming, p2p transaction, VoIP services, emails and other data usage that may consumed your data allocation.
For example, downloading a single 1080P torrent movies for 2GB.
Depends on the transfer rate of your internet connection in Mbps. Once you get the rate and constantly use it over a long period of time, then it would be easy to calculate it.
If you want a calculator for it, then please refer to CalcTool: Data transfer time calculator