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50GB for the simple dual layer discs. You can theoretically reach 100GB with triple layer disks. The largest BDRip I have is 90GB for the Super Mario Bros. Movie.
Edit: UHD Blu-ray only supports dual and triple layer disks, not quad. Quad layer discs do exist though, with up to 128GB of capacity.
Some also do have specific use cases where they work really well, like Tea Tree Oil for acne and nail fungus or Peppermint oil for nausea. Most of them don’t do anything though.