According to Searchengineland.com, Google has decided to remove the 30 day conversion window in AdWords. With the 30 day window gone, AdWords users are now able to customize the conversion window from as little as a week to as much as 90 days.
Giving advertisers a better amount of historical data to work with is good news for those whose cycles take long than a month after an ad click. Those who wish to shorten the window, can. So far, the steps that have been taken are all for the good of advertisers.