Then your friends should reflect a bit. This study shows that there isn't a positive nor negative effect. If your friends are working additional hours each day

Then your friends should reflect a bit. This study shows that there isn't a positive nor negative effect. If your friends are working additional hours each day when they work from home and they are representative of this study, then they are working more time to be as productive as they used to be. If they would just use the "extra" time to live their own life, they would probably be just as productive and have additional time to themselves.