A run of 47 feet with one downspout will only work in areas of little rainfall. I would have two. As attractive as low cost materials from a big box store seems, I would go the route of one continuous gutter. There are companies that will drive up to your house and make whatever lengths you need and then drive away. They will even have all the parts you need to do the job. The gutter material will be beefier then the big box stores and it will be easier to install.