I’d like to say a couple of months (and if we used existing rather than built fresh, I think we could manage… but that’s another question), but knowing how unorganised shared software development goes… it’s going to take longer.
Particularly because we have major holidays coming up in the next couple of months, we’re going to be stretched for development time. Once we get into January, we might start picking up the pace a little, and then we can look towards finishing an MVP.
I’d guess we could have a bare-minimum product by… say Spring 2020. I won’t try to be more accurate than that, because I honestly don’t know. If we have someone who’s an absolute whiz at .NET Core MVC and has some time to burn, it could be quite a bit quicker, but that person is not me.