how much data can be transfered using usb cable? real usage per second, per minute, not theoretical can the charging stations resume data transfer if i unplug

how much data can be transfered using usb cable? real usage per second, per minute, not theoretical can the charging stations resume data transfer if i unplug and replug at random times ? i dunno, when i want to dump gb of data from my phone, it takes hours ... so yeah maybe i should stay at a random charging station for hours to ensure all data transfered :D