$ time sudo ddrescue -f /dev/sda /dev/sdb log
GNU ddrescue 1.23
Press Ctrl-C to interrupt
     ipos:    1000 GB, non-trimmed:        0 B,  current rate:  69230 kB/s
     opos:    1000 GB, non-scraped:        0 B,  average rate:    103 MB/s
non-tried:        0 B,  bad-sector:        0 B,    error rate:       0 B/s
  rescued:    1000 GB,   bad areas:        0,        run time:  2h 40m 54s
pct rescued:  100.00%, read errors:        0,  remaining time:         n/a
                              time since last successful read:         n/a
Finished                                     

real    160m58.893s
user    1m22.638s
sys     28m32.347s