In the old days, it was almost certain that young men would take three months out of their life to ordain as a monk. Even HM The King did it. However, these days men tend to go straight from university to work and often skip being ordained. Young men ordain as monks to make merit for their parents and sometimes there is family pressure for them to do it. As a compromise, they might only ordain for a week. I know someone who did it for just a few days. I believe that if you work in government services then you are actually allowed paid time off work to become a monk for a few months.