08-03-2015, 08:15 PM
My data collected over the last month shows that the game transfers about 10-12 MB per 1-2 hours, depending on variety of factors (idle only or active "clicking", being in party or on your own, mining/woodcutting/training/pet arena). When my PC is out of reach I leave the game on full time only when I have it plugged into a charger and when I have wifi connection. Otherwise, I mostly log in to collect stuff and log out.