Management consulting is such a broad topic and includes so many different roles. E.g. working at Accenture and living in a hotel for 3 months certainly would distract from your family life to a degree. However, if you work at a firm with less requirement to travel then less so. Consulting hours can be long but I suspect they compare with most other professional services - certainly not 9-5, but 14 hr days are not as common as some people here would have you believe.