I'm not necessarily against the idea, but I suspect that it would exacerbate existing issues with team members in different time zones. For example, I work on the US east coast and everyone else in my team is on the west coast - a difference of three hours. My coworkers <i>already</i> tend to be unreachable or uncommunicative in their mornings. If they were to follow the advice in this article, they would almost certainly formalize that by limiting their "allow" time to their afternoon. Since I already end my own "allow" time at dinner, that only leaves about two hours a day when the two overlap. Even if they didn't consistently fill those two hours with meetings among themselves within their own time zone, that wouldn't be enough. It's why I have a 6:30pm meeting this evening, which is <i>super</i> unwelcome but it's what I have to do. At least it's not on a Friday this time. This situation would be even worse with a five- or eight-hour time difference.<p>I don't think this system can work if everyone can just arbitrarily choose which hours to leave open, on a team distributed across time zones. There would have to be some kind of rules to ensure sufficient overlap. That means some people might not get the absolutely perfect schedule they wanted, but too bad. Be adults. Better for everyone to make <i>some</i> accommodation than to force everyone in the minority time zone to work majority-time-zone hours - which is basically what I see happening to everyone in my situation. We don't need to make that worse.