There was a small "presentation" where people could show what they had accomplished during the hackathon, which gives a rough estimation of what you are looking for. It was a google doc, but I have no idea where it is now.
Hackathon google doc: https://docs.google.com/document/d/1qrn7JZS62hzsylpGM1VhaT6YW2I1NVDDGQsANv5b1GQ/edit?usp=drivesdk
