Our bodies are not machine people!!!! You cannot measure the whole ARS time frame that way. Everyone is different, some show all the symptoms, some experience some symptoms, and others don't feel any symptom at all.
To tell you "by the book", ARS appear 2-4 weeks post exposure. They will last 1-2 weeks, or even longer in some cases. One of the experts in this forum, Dr. Sean Cummings said that the 3 most common ARS which are likely to appear altogether during the primary stage of infection are: high fever, very sore throat, and rash.
See:
http://www.medhelp.org/user_journals/show/180278/HIV-Symptoms
The majority of the newly infected people (70-90%) will indeed show symptoms, and high fever is most likely to be present. So that leaves about 10-30% of newly infected people who won't show any symptom at all. Many people also believe that they are experiencing symptoms, while they're actually not infected at all and the symptoms are most likely due to their anxiety.
That is why symptoms or lack thereof are NEVER reliable. The only way to find out whether or not you're infected is by getting yourself tested 3 months after possible exposure.