Question: how long does it take for a skinny person to gain muscle?
Answer: So to summarize all of this, the skinnier you are, the more muscle you'll need to build, but the more quickly you'll be able to build it. In the end, you should be able to build an attractive body within 6–12 months, a respectably muscular body within 1–2 years, and an impressively muscular body within a few years.