From looking at three audio folders for three days of filming they have 4.85gb, 13gb, and 13.11gb respectively. That’s the on-set audio itself. Lots of poly wav files. 1-2 boom mics, 2 lavs, operator’s mix for L and R channels.
Is it possible that the file is genuinely that large (5.58gb)? I completed a feature film of mine this last year with the same system and same re-recording mixer. It was a 90 minute film and the three reels I sent him (30ish minutes each) were all around 3gb each, so 9gb altogether.
This short film is must 24 minutes. We had a different sound mixer but both used poly wav files and had a comparable number of channels/tracks per file.