Ran into a surprise when we added Google Conversion tracking to an existing account. We’re seeing lower than expected conversions for the dates after implementation but we’re also seeing conversions coming in from up to a month back. Ends up their conversion tracking has a 30 day cookie and allocates conversion based on the first click. So, if someone clicks on March 1’st and Converts on March 30′th, the conversion will show up on a report on March 1’st.  Most of you experts know this, but I’m still getting back in the game :-) 

Full response attached:conversion-tracking.doc