There are limits to the possible swings in the EI premium rate that are set out in the proposed legislation. How soon that would have to be repaid depends on two things: on the extent of the repayment that would be required; and then on the room that would be left once economic conditions are taken into account--so the room that would be left, the 15¢. If, for example, the premium rate is estimated to need to increase by 10¢, that leaves 5¢. Depending on the size of the repayment that was required, then that would affect the length of repayment.
Maybe my colleagues from HRSDC want to add to that.