The official DJI prop guards are about 18.7 grams each. Think the non official detachable ones might weigh a little more because of the holder size.
Not sure what the exact flight time reduction will be ( not observed it that much ) because not only weight but also drag and flying style will have an effect. But with the official guards on the Phantom 3 will weigh 5.8% more. So ONLY taking weight increase into consideration and the advertised flight time of 23 minutes , flight time would reduce to 21.5 minutes.
If its such a concern, I would suggest only using the guards when you really need to ( flying indoord, close to buildings )
Hope that helps..
Remember to buy extra propellers and one or two spare batteries to keep you flying
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