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I dip for 15min + depending on the piece.
Revive is very harmless unless it is used on sensitive thin branched acro's.
From my experience anything on the coral is dead within a minute or two. I think 15 minutes is excessive, Revive may be harmless, but it will stress a coral nonetheless, especially acro's. No need to subject the coral to additional stress if everything is dead within 5 min. Everybody has their own routine that works and this works for me.