but what will happen if they don't share all the Smerit within the one month, will the Smerit collected back or it will get exhausted? what will happen to the Smerit?
AFAIK, talking about the merit sources sMerits they will
not be carried forward for next cycle. Whenever the new cycle begin they will get the amount filled with what they are allocated for. sMerits are just numbers it can be increased or decreased by one tap if theymos wants too and since being a merit source is a voluntary job don't expect them to spent their hours to spend their allocated quota.