Thread:Extension talk:SemanticUpdateOnPurge/Is there a way to auto-purge after saving?/reply

Which version of SMW do you have in use? I think in some newer version, Jeroen added the feature that the articles cache will be invalidated right after the first rendering after the save, which basically triggers an immediate purge. So far I was not able to confirm that behavior though. If that doesn't work for you, it shouldn't be much of a problem to write an extension that invalidates the cache after a save. See. Alternatively, this sounds like you could also use my extension Extension:Variables to calculate the hours worked right throughout the template calls and then simply display them wherever you want with  or even   (in case you want to display it in an info box on top for example). This would probably take some good load from the server.