I've been programming for 20 years and as of now it takes me about three months to build a MVP solo. That's full time, binging on coffee, sleeping under my desk. There's always unforeseen things that creep up and create a total brick wall for you. Whether that is a library issue, a cryptic bug, an architecture problem, or unknown complexity. Probably all of the above. You will meet these challenges, and you will overcome them. Just not in 30 days.

"Build half a product, not a half-ass product."

–Getting Real