Update README.md

README.md

@@ -171,7 +171,7 @@ of 0 means that idle connections are never removed from the pool.  The minimum a
 This property controls the maximum lifetime of a connection in the pool.  An in-use connection will
 never be retired, only when it is closed will it then be removed.  On a connection-by-connection
 basis, minor negative attenuation is applied to avoid mass-extinction in the pool.  **We strongly recommend
-setting this value, and it should be at least 30 seconds less than any database or infrastructure imposed
+setting this value, and it should be several seconds shorter than any database or infrastructure imposed
 connection time limit.**  A value of 0 indicates no maximum lifetime (infinite lifetime), subject of
 course to the ``idleTimeout`` setting.
 *Default: 1800000 (30 minutes)*