Many organizations leap into a knowledge management solution (e.g. document management, data mining, blogging, and community forums) without first considering the purpose or objectives they wish to fulfill or how the organization will adopt and follow best practices for managing its knowledge assets long term.
The study found a variety of results, with one couple lasting a little over 30 seconds and another lasting well over 40 minutes. The median average of time sexual intercourse lasted, however, was 5.4 minutes, according to the study. The average time for sex was also dependent on age, with younger men lasting 6.5 minutes, and the 51-year-old and up crowd coming in at 4.3 minutes.
So if you are in your fertile stage and have Watery or EWCM then sperm can live anywhere from 3-5 days if you have sex a few days before your period then sperm can only last about 24-48hours... I posted this link as well if you wanted to read it..