How many years has Stanford University won the award for success incollegiate sports?

There's no single "award for success in collegiate sports" that Stanford (or any university) wins yearly. Success in collegiate sports is measured across various metrics and different sports. Stanford has had periods of significant success in many sports across its history, winning numerous national championships and accumulating high rankings in the Directors' Cup standings (a composite ranking of athletic programs), but there's no single annual award they win for overall athletic success.