Fifteen to twenty days. Freshmen's military training usually lasts for fifteen to twenty days, because the contents to be studied in fifteen to twenty days include * * * synchronous education and training, team queue action training, light weapons shooting simulation training and tactical training, fighting foundation, battlefield medical rescue, nuclear, biological and chemical protection training, etc. It is to improve students' self-care ability, cultivate ideological independence, cultivate hard-working, hard-working, strong perseverance and collectivism, and develop a good life style.