Usually as long as it takes for one of the other party in a marriage, to start suspecting and discovering the affair, which generally leads to separation and divorce. The affair, then may continue but is no longer called an affair but a relationship or a concubinage.
ANSWER:
It depends if the spouse can keep his or her affair as long as he or she wanted it to go. But in reality there are some who still continued even though the affair is been discovered.
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