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by jondubois 3858 days ago
Just pick something you really enjoy and it should be feasible.

I started SocketCluster (http://socketcluster.io/) on the side about 2 years ago while working 45+ hours a week for a startup.

I still spend about 10 to 20 hours a week on it. It's been a great learning experience - The kind of experience that's impossible to get from just being a full-time developer.