6*4*((1000.0/1024)**3)*1024**2/1040/60/60 = 6.26001602564
(8*60+18)/(2.28/100)/60/60 = 6.06725146199
45.32% done, 18:25:58

18.43277777777778
6.163633743815
2.7933588126969577

left: 9.475785221265822
speed: 8.29352441614
avg: 8.884654818702911