[MacDV] how many hours (QT) will fit on 500GB drive?

[Malcolm Hamilton]

Hi there,
I'm wanting to copy 20 seasons-worth of the tv show I work for, onto  
an external fw hard drive.
I'm playing the original half-hour Sony SP and SX show tapes, through  
a Media Converter (firewire out) into my G4, via QuickTime, and onto  
a 500GB external drive.
Can anyone tell me how many hours this drive will hold, with whatever  
compression QT uses?

Thanks,
mhcbc