Claiming honours in rubber bridge
From the 2014 Laws of Rubber Bridge:

Law 76 - Responsibility for the Score
....  Honors may be claimed until the next hand has been dealt, or the
rubber has been completed and scored - whichever comes sooner.

and

Law 78 Correction of the Score
When it is acknowledged by a majority of the players that a scoring error was made in recording an
agreed upon result (e.g. failure to enter honors or incorrect
computation of score), the error must be corrected if discovered
before the net score for the rubber has been agreed to. However,
except with the consent of all four players, an erroneous agreement as
to the number of tricks won by each side may not be corrected after
all players have called on the next deal.
In case of disagreement
between two scores kept, the recollection of the majority of the
players as to the facts governs.