See Full Constitution
Section 42. Compensation of members -- Length of sessions -- Legislative day.
The members of the General Assembly shall severally receive from the State Treasury compensation for their services: Provided, No change shall take effect during the session at which it is made; nor shall a session occurring in odd-numbered years extend beyond March 30; nor shall a session of the General Assembly occurring in even-numbered years continue beyond sixty legislative days, nor shall it extend beyond April 15; these limitations as to length of sessions shall not apply to the Senate when sitting as a court of impeachment. A legislative day shall be construed to mean a calendar day, exclusive of Sundays, legal holidays, or any day on which neither House meets.