How long do casual relationships usually last? Casual relationships usually last anywhere from a few weeks to about three months. It is often that at about three months time you will usually know where you want to go in the relationship from there. However, there are really no rules for casual dating relationships.

How long should you date someone before getting serious?

Just over one in five (22%) say people should wait one to three months before introducing a significant other to their parents and close family; another 22% think couples should wait a bit longer, until theyve been dating four to six months.