An addendum to my previous post on parenting:
Some professions require a lot of time away from family. Sometimes, these situations are unavoidable - either because of unfortunate circumstances or because of a spiritual calling. These parents have a doubly difficult task: to work hard at a demanding job, yet be physically, emotionally, and mentally connected to their spouse and children as often as possible. It can be done, but one must be always on guard for warning signals and open to changing course, even if it means overcoming fear or ego.
Consider yourself blessed if you never find yourself in this position.