I think you can do 1000GB transfer in one day if you max out at 12.8MB/s.
If you do 12.8X60 into seconds then X60 again to get into minutes. Then muliply by 24 to get total transfer in a day. Then divide it by 1000 to get into GB and voila you have 1105.92GB.
So really 3-5 days 400GB is totally possible.
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