According to Katarungan Pambarangay. It should not exceed 30 days, non extendible po ito except in some meritorous cases.
Section 3 from P.D. No. 1508, Katarungang Pambarangay Law
d) Sanctions. Refusal or willful failure of any party or witness to appear in compliance with the summons issued pursuant to the preceding two (2) paragraphs may be punished by the city or municipal court as for direct contempt of court upon application filed therewith by the Lupon Chairman, the Pangkat Chairman, or by any of the parties. Further, such refusal or willful failure to appear shall be reflected in the records of the Lupon Secretary or in the minutes of the Pangkat Secretary and shall bar the complainant from seeking judicial recourse for the same cause of action, and the respondent, from filing any counterclaim arising out of or necessarily connected therewith.
Willful failure or refusal without justifiable cause on the part of any Pangkat member to act as such, as determined by the vote of a majority of all the other members of the Lupon, whose decision thereon shall be final, shall result in his disqualification from public office in the city or municipality for a period of one year.
e) Time limit. The Pangkat shall arrive at a settlement/resolution of the dispute within fifteen (15) days from the day it convenes in accordance with paragraph (c) hereof. This period shall, at the discretion of the Pangkat, be extendible for another period which shall not exceed fifteen (15) days except in clearly meritorious cases.
Hope this helps.