A2A, an engineering team and six months.
People vastly underestimate the amount of work that goes into building websites. Every website must be polished, responsive, modern, or nobody will use it or trust it and it will just sit there unloved until you finally give up on it and shut it down.
I know a guy who sank tens of thousands of dollars on consultants to build a “simple” website to match fitness service providers with potential customers. Never got it off the ground.
If you were an experienced web developer like me, you could implement something extremely basic over the course of a few weeks / months. You’d already know what to use and what the challenges would be and the basic approach you want to take. Even then, it would only be a proof-of-concept and only of mild interest to anybody.
It would be at that point where I’d start looking for investors and / or business partners to help actually turn it into a real product. I’d give it at least another six months before I had minimal revenue flow. Another year or two to profitability.