I just laid down 11 tracks of fiddling, about 4.5m to a track, for a www toy/tool I'm working on. That's an album's worth! It took about two hours (plus a bit to upload and post), and quality is accordingly low -- first try only for all but a particularly bad try. But that's a bunch of stuff to accomplish, and I'm proud of putting it out. Yay!
@rjl20 altho this (https://www.soundabout.net/audio/convert-cassette-to-cd/reel-to-reel-tape-running-times/) says that you'll only obtain 15-20mins of fiddling