Donovan McNabb to serve 90 days in custody, 18 of them behind bars

For second-offense DUI in Arizona, former NFL quarterback Donovan McNabb faced 90 days in prison. Per multiple reports, he’ll serve 18 behind bars — and another 72 on house arrest. McNabb, who had been working for FOX Sports and NBC Sports Radio, has largely been out of the spotlight since the arrest. Via ESPN.com, McNabb…