Some last a few weeks, some for years. The percentage of the person one is cheating with becoming married or in a strong relationship is extremely low statistically. Once a person cheats on their mate for another, the other guy/girl will wonder eventually if this could happen again. Some people cheat because they are missing something out of their marriage or they just love men or women. If one is having problems in their marriage they could try harder to communicate, seek marriage counseling, etc., and there is no need to cheat. If the girl/guy just loves the opposite sex and wants no commitments then they should say so up front. If the above doesn't help the marriage then the two should at least separate. There are simply no excuses for cheating! Extramarital affairs can last forever, as long as its working for the cheaters.
The odds of affairs lasting are always extremely slim. The individuals involved have to realize this is an encounter and regardless what is said between them one rarely leaves their wife/husband to be with the "other" person.
ANSWER:
Can it? it depends on the person and the affair partner. If the married man fell in love with the other woman and vice versa, it will be a struggling decision and the result will be messy.
As long as you want it to.
Another answer:
It lasts as long as the mistress is willing to accept being treated like dirt.
The XYZ Affair
Dorthy Height actually did have an affair.
Dreyfus affair happened in 1894.
the XYZ Affair was not a success it was a failure
Marie Antoinette had an affair with the swedish Count Axel Fersen.
This Is My Last Affair was created in 1936.
The Last Affair - 1976 was released on: USA: September 1976
The Last Affair - 1976 is rated/received certificates of: USA:R
Last affair
A Current Affair - 1971 Last Chance is rated/received certificates of: Australia:G
Gabriel and Esther's affair lasts for several months.
Not for so long.
Built to Last - 1997 A Family Affair 1-3 was released on: USA: 15 October 1997
10 years
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.
He was having an affair with the Drummers partner, after that he was kicked from the band.
Katharine Hepburn