[AwesomeFaic]

I was at a company for 6 months that started with 9 hour days and after 4 months turned to regular 10-14 hour days. The worst was a week of 10+ hour days straight, usually there'd be one "normal" day each week but something was always going wrong (having to meet unrealistic deadlines, systems breaking, etc). Glad that experience is in the rear-view, it taught far more on self respect/care and connected me to a lot of great people (who also left soon after I did).

Edit: Forgot the initial question. It was a huge negative influence on an existing long-term relationship. If I stayed at that company it likely would have ended the relationship.