Quite often the recovery s/w needs plenty of time to process even with minor recovery. Give it an overnight treatment(or longer), start before bedtime and even on next morning monitor status. If it has proceeded beyond some stage its working just slow allow it to work. Since this is DVD disc, clean as best as possible then allow process to start. If there is actual surface damage, it may not be be able to recover at that location of data, but if it actually is processing, it will just take longer and finally finish with what it has. It may have error with the data but the file itself is recovered(depends). In other words you're getting something but not a total pristine file again. The status report should explain what it had done.