As a kid, I went on trail camp. We would hike for about a week, walking about 10 miles a day with a heavy pack. You get into a routine: rise, eat breakfast, take down the tent, pack up, start hiking. Stop for food. Continue hiking, make camp in late afternoon. Go down for the night, start over.
Getting into the routine was easy, and eventually "civilization" felt very, very far away. To the point that you would think about simple things like soft beds and flushing toilets as incomprehensible luxuries.
Getting back into the real world was always more of an adjustment than leaving.