Not a googler, but I'm related to one, and I'm told that it's dependent on your ability to set boundaries for yourself. Nobody should dock you for saying "hey,

Not a googler, but I'm related to one, and I'm told that it's dependent on your ability to set boundaries for yourself. Nobody should dock you for saying "hey, I'm working on my 20% time now". If 20% time is dying, it may be partly that there are some bad managers who will dock you for it, and it may also be partly that programmers would like it but don't feel empowered to use it (for political/personal/personality reasons).