Google announced you can now customize the conversion window length from a flat 30 day period, now to a period anywhere between 7 and 90 days.
Google said, "We're also adding the capability to customize your conversion counting window from 7 to 90 days after a click. Previously, AdWords only counted conversions occurring within 30 days after a click."
To customize the conversion windows for your campaigns, go to "Conversions" tab under "Tools and Analysis" section and click edit on the conversion window area.
Here is a screen shot:
I am surprised more advertisers are not talking about this small but important customization feature.
Forum discussion at Google+.
Image credit to BigStockPhoto for store window