Several years ago I heard about a well-known Tibetan monk who had left his teaching schedule to go on a wandering retreat in the Himalayas. He was gone for four and a half years and when he came back and offered a retreat in Minnesota, I went. Here is his story and a little bit of mine:
https://spiritualityhealth.com/articles/2019/03/12/who-is-mingyur-rinpoche#