"Yahoo! will send each designated primary household member (one per household) a $50 U.S. Savings Bond after the software is installed and transmitting data. The bond is given in consideration of your first six months of participation in the Panel as an active participant. At the end of your first six months, and every six months thereafter during the period that you remain an active participant in the Yahoo! Panel, Yahoo! will award you another $50 U.S. Savings Bond in consideration for your next six months of participation in the Panel. Participation in the Yahoo! Panel is only open to U.S. residents who install the software on a home PC used solely for personal reasons"
SIX MONTHS!!!!!!!