With the latest data coming in, I multiplied the amount of seconds by 50 to get 100%
progress 1% (read 21474836480 bytes, zeroes = 0% (213909504 bytes), duration 5852 sec)
progress 2% (read 42949672960 bytes, zeroes = 0% (213909504 bytes), duration 12588 sec)
Result is I have to wait 7.2 days...