If you are traveling to El Salvador with Canadian passport in most cases you do not need to obtain entry visa to El Salvador at the consulate beforehand. The period of stay though may be limited by the laws of El Salvador. You may check what is the allowed period of stay at the El Salvador consulate in Canada. All other applicants should check information on El Salvador visa requirements, procedure, application forms, fees and processing timings may be found here: http://el-salvador.visacenter.ca.