Regular Trading Day

Regular Trading Day. Means the regular trading hours of a Trading Day on the Principal Trading Market shall be open for business (as of the date of this Agreement, such hours are, for most Trading Days, approximately 9:00 or 9:30AM to approximately 4PM Eastern Time; provided, however, that certain Trading Days may have shorter regular trading hours; and provided, further, that the regular trading hours may be subsequently changed for the Principal Trading Market). 2