The "90-days" referred to in that notice is the transition period for transitioning between FINRA policies. The transition period began on 11/20/2014 and ended 90 days later. During that time both the old policy and the new policy were in effect. After the 90 day transition period ended, only the new policy was in effect. The 90 days refers to the policy change transition, not to the amount of time the D remains on stocks.