It's human nature to stop "screwing around" in order to get "real" work done and make your boss happy. The only way to keep 20% time is to force everyone to take it. If others on your team stop doing it, then the competitive balance isn't fair anymore. If your boss can get away with unofficially taking it from you, then she will. Something like 20% time must be in the company policies with punishment for those that discourage it.
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