Depends on how you use them. What I do, the second the first torpedo hits there's no point in being quiet anymore since everyone knows there's a sub in the area. So I go to ahead flank, kick out a decoy, and head for the deep. Mark an X on the chart so you know where the decoy is. The bubbles last 10 minutes, so run at flank for 4 or 5 minutes, 1200-1500 yard separation from the decoy, reduce to slow speed. With the external cam on, in most cases you'll see at least one of the escorts dropping depth charges on the decoy.
The decoy alone is never enough, it has to be combined with other methods of evasion, especially going deep.
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