Backup Time

Calculating a backup has several variables, but a reliable estimate can be arrived at using an internal hard drive to hard drive architecture as high speed hard drives can transfer data at a rate of approximately 1 gigabyte per 1 minute. Hence, using the drive-to-drive method, a full backup of a computer with 100 gigabytes of data should take roughly between 1 1/2 to 2 hours. This number, however, is theoretically "best case" scenario that a full backup of this size could be completed in and is unlikely to be experienced in a real world environment. A more realistic time metric would be to use a factor of 1 gigabyte of data taking 3 minutes to backup which would increase that 100 gigabyte full backup to approximately 5 hours. It should be noted that using a second hard drive in your system internally is not a reliable method of securing data, because of theft or a catastrophic fire. This method is provided as a best-case scenario to work from and is not a recommendation as a way to secure data.

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This wickipedia article explains how fast the USB data bus runs at and you can then work out how long it will take to backup your drive. It is all based on the speed and amount of data you want to transfer.

https://en.wikipedia.org/wiki/USB