Pre-Written vs Homebrew Adventures

I think if there was a module similar to the pathfinders society adventures that only take 2-3 hours in a sit down table setting would be a really good place to start with a new system. I think it might be good to start one of those here as well just to get used to GMing a PbP campaign. And that way if the group falls apart you didn't invest a ton of time on a home brew just to have it fall apart.