Amendment of investment period limits extends prescribed investment durations for notifications under central excise regime. The Ninth Schedule amends notifications under section 5A of the Central Excise Act by substituting extended investment timeframes in conditions (C) and (D): G.S.R. 679(E) replaces 'six months' with 'two years'; G.S.R. 60(E) likewise replaces 'six months' with 'two years'; and G.S.R. 60(E) as amended by G.S.R. 419(E) replaces 'two years' with 'four years' for investments made from an escrow account, each for the respective periods of effect specified.