Pak v NZ 3rd test - which rule allowed umpires to extend game for 15 minutes before tea on day 5?

[Trichromatic]

Pakistan were 8 down and Williamson asked for 15 minutes extension. Umpires allowed it.

 

Couldn't find it anywhere in rules. Even commentators expressed their surprise. I haven't seen it before. 

 

30 minutes extension if batting team is 9 down is common, but that is decided by umpires. Here captain asked for extension and got it.

[velu]

for indian tail , they will give 15 min extension even  if we are   6 down

 

[Trichromatic]

1 hour ago, Stumped said:

Captains can claim a 15 minute extension of a session if the umpires believe an innings can end given the extension. It's the same case for the 30 minutes at the end of a day if it will bring about a result.

But which rule is that? Any links for the rule? 

[Trichromatic]

8 minutes ago, Stumped said:

You'll find it in the playing conditions here: https://www.icc-cricket.com/about/cricket/rules-and-regulations/playing-conditions.

Thanks, found it.

Quote

12.8.2 At the Lunch or Tea Interval The umpires may decide to extend play by 15 minutes (a minimum of four overs) at the scheduled lunch or tea interval of any day if requested by either captain if, in the umpires’ opinion, it would bring about a definite result in that session. If the umpires do not believe a result can be achieved no extra time shall be allowed. If it is decided to extend play, the whole period shall be played out even though the possibility of finishing the match may have disappeared before the full period has expired.

If at the conclusion of this extra time, a small number of runs are required to win the match and both captains wish to continue playing in order to achieve a definite result prior to the scheduled interval, play will continue until either the match concludes or the players have cause to leave the field for any other reason. The following session of play shall be reduced by the amount of time by which play was previously extended under this clause.

 

[Global.Baba]

We might have complained too had we been on the receiving end but for a change, good call by umpires to give some time to get a result from a test that had some of the most boring batting in the last 30 odd years in an awful atmosphere to play cricket.