How long will it take to transfer 10TB of data at 60Mbps, 80Mbps, 1000Mbps ?
To calculate transfer time divide the amount of data by transfer speed like this:
(10 terabytes) / (60 Mbps) = 16.1817284 days
(10 terabytes) / (80 Mbps) = 12.1362963 days
(10 terabytes) / (1000 Mbps) = 23.3016889 hours
Or have google do it for you like this
WolframAlpha is great for this kind of calculations : 10 terabytes at 60mbps