It took about 6 weeks to actually built out the MVP for LivePIng. It's been a while since I did web development so brushing up on current version of technology also caused me to take longer than I like.
I was mostly working nights and weekends on my spare time.
The tech stack is React for client, and Rails for API since I know the latter pretty well and I don't think there are anything out there yet that can beat Rails on speed for prototyping or initial proof of concept.
In order to set a hard line on when the MVP will be completed, I utilized GitHub's Projects and Issues extensively as a way to track development.
Next step is to setup a reliable infrastructure that can scale without exploding cost. This is my realm so it shouldn't take too long. :)