The 90-day limit mentioned in the specifications was intended as a simplification that will reduce or eliminate positive moment for most cases. An analysis can be performed to determine the effect, if any, of establishing continuity at an earlier age. Several factors affect the potential positive moment that may be developed if continuity is established at an earlier age, so there is no simple answer to the question. However, the 90-day limit is a complication for fabricators and contractors and can be eliminated or reduced in many cases.