As far as we should be concerned about the ancient monks' tradition, a monk should spend at least five years with his teacher. Some days you should avoid speaking to anyone. Don't allow yourself to speak or talk very much. Don't read books! Read your own heart instead. Take Wat Pah Pong for example. These days many university graduates are coming to ordain. I try to stop them from spending their time reading books about Dhamma, because these people are always reading books. They have so many opportunities for reading books, but opportunities for reading their own hearts are rare. So, when they come to ordain for three months following the Thai custom, we try to get them to close their books and manuals. While they are ordained they have this splendid opportunity to read their own hearts.