It just keeps calculating time

So I dont have much experience with this program as I only recently got it to back up, but this still strikes me as an issue. Im backing up my computer to a 3TB seagate harddrive and the backup is just sitting at a .tib and to the right remains at "time left: calculating...". This continues to happen after running chkdsk, switching usb ports, rebooting and waiting for well over an hour.

EDIT: I dont know how to delete, but I just had to wait even longer for whatever reason, no need to worry. sorry for the inconvenience.