Fellowship training also makes an individual more competitive for some private practice jobs. This is good way to keep abreast of the field and to do some teaching as well. Urologists, like other surgeons, generally like to start the day early. Sunrise is a wonderful time of day, quiet and contemplative. As surgeons, we need to see patients and also operate, and therefore with more limited time than internists and other non-surgeons, tend to be very efficient at getting things done.
Most urologists like to operate in the mornings and see patients in the afternoon.
How late we leave at the end of the day is a very individual thing and is probably no different than in any other field. Although it is denied by many, each field in medicine certainly has a caracature of the average practitioner. Whether or not a career is compatible with a family depends more on the family than the career. Priorities are priorities and they arise from within individuals. It may be true, however, that personal control over your life may be limited longer in a field like urology than family practice, as the training period is longer.