How long did you take to build the MVP?

I know a lot of fellow builders who take months to build a product that has not been tested in the market. Then there are others who build the product in days or weeks, test it in the markets and decide whether to continue to build it or abandon it.

For me, I was certain that my product is validated and needed in the market. It took me about 4 months to build the MVP.

What about you?