Maybe it's just me, but the last negatives I scanned took most of my evening, i.e. about 3 hours start to finish. That was a set of 10 6x7 colour negatives, so it would definitely take me two evenings to sort out a 36 exposure roll of colour negs if I had to use my v550. That's: dusting off, loading the negatives into the holders, the actual scanning, filing the negs back in the sleeves, importing the files into colorPerfect, fiddling with the colour balance, dust spotting them in Photoshop, importing them into Lightroom and adding keyword tags, probably some more tweaks to the colour and contrast and a bit of cropping etc.
In the same time I could mix and warm up RA4 chemicals, print a contact sheet, then select and print four or five big prints from the roll. They would be dry and ready to view while my 'digital self' was still hunched cursing over the computer