Chair reschedules all instances to have a duration of 1/2 hour less than whatever it is now.  This should yield a recurring meeting with following date/times:

    04/25/05    0900-0930
    04/26/05    1000-1030
    04/27/05    0900-0930
    04/28/05    1100-1130
    04/29/05    0900-0930