Following the many rumors of AdSense changing the time frame of AdSense referrals eligibility from 90 days to 180 days, the new interface change on Google AdSense has also included the date change many publishers were hoping to see. AdSense silently changed it from an unlimited signup referral period to a 90 day time limit at the end of January.
AdSense has now officially changed it from the silent 90 days they added recently to 180 days.
You may have noticed today that the time limit for AdSense referrals is now 180 days. Based on the feedback we heard, we agreed that 90 days may not provide enough time for your referred publishers to complete earning $100. Therefore, we decided to double the window. This change is retroactive, so it will also apply to AdSense signups that occurred more than 90 days but less than 180 days ago.
The change is now noted in the control panel for referrals.