Well I just saw 2 models of Pioneer on the web, that claimed 30 minutes for a full burn for one drive and
1 hour for the other cheaper one.
Most of my harddrives, IDE 7200 rpm, have a sustained read speed of about 6 MB/sec. So if I were to assume that as the
maximum speed, that would give a 4.7 GB transfer time of about 14 minutes. So my guess would be that even if the DVD
drives were to achieve phenomenal throughput, most people will be limited by their harddrives sustained read speed.
EDIT: Forgot to mention that was 30 minutes for 1x drive and 1 hour for 2x drive.