The coupon has usually been equal to the cost of two 24 hour packages (there may have been some very rare instances when it was more). In the Surf package availability era, it was equal to the 24-hour Surf package (not Stream). The remaining days package is available till two days remaining. On the last full day that usually goes away and only the 24 hour package is available (at its higher cost per day). In the past there used to be a 1-2 hour package (for airline check-in use, etc) for about $10 on the last day but that seems to have been eliminated.