We have approximately the same amount of leisure time as most adults. Some of the more common choices are sports, movies, TV, reading, sharing with friends and enjoying the outdoors. It takes four years after college or eight years after high school, the same as for many professions. There is no certain age to start preparing for the priesthood. Some people go to high school seminaries, others enter the seminary after high school, after college, or after they have been working for years.
Diocesan priests make no vows.
For ordination, they freely make promises of celibacy and obedience to their bishop.