A period specified by Section 174.155 or 174.158 may be extended:

1. (1) by the written agreement of the parties for a reasonable period; or
2. (2) by the arbitration board for good cause for one or more periods that in the aggregate do not exceed 20 days.

Added by Acts 1993, 73rd Leg., ch. 269, Sec. 4, eff. Sept. 1, 1993.