ETA on development is not something you should pressure but when it is getting to 1.5 years, that is a bit of questionable situation as well. I don't know if mintdice has inhouse developers or people they have always worked with, however it feels like making an upgrade on an existing website should not normally take over 1.5 years, it will be nearly 2 years if it publishes soon, and that is if they manage to do it.

I am afraid if mintdice do not have any type of in house developer and working with others on per hour payment method, I am afraid they might be taking advantage of the situation, if it is fixed amount it could still be a bit of a problem where developers take other jobs in between. So, I hope it is inhouse, because if it is not this 1.5+ years development doesn't sound good.