OP here. I started this project a few months ago, around early October. I wrote the meat of the solidity contract in a weekend or so, but the hardest part (of course) was writing all of the UI. That took another few weeks of intermittent nights and weekends.

Since then, I've just mostly been putting polish on it (testing, more refinements) mostly around making the app more responsive.

Happy to talk more about it-- it was a fun project that pulled together a lot of threads (Solidity, React, Web3, Infura, etc..)