If the tapes have indexmarkers for every shot, every single shot can be captured as a seperate file.
That way you can load the footage from one tape, check it and throw out the shots that won't be used at all.
On short projects I used to load a tape as a single or 2 files.
But with projects with over 25 hours of material I preferred the single shot method.
This way I could kick out 10% after a first look.
Wish her good luck with that much footage. I fear my head would explode with that amount of footage