midnight conference calls

We had a short discussion about Farrah's mention of having conference calls at midnight.

I agree that this is ridiculous, and should not be allowed. I do remember, though, being at Richards Group last year for agency day and asking how many hours a week they work. The young girl that had been working there for about 3 or 4 years paused and said that it varies. She explained that the Richards Group looks for people who are hard working and do what needs to be done to get the job done. She never gave an idea of an average work week. I felt like by asking how many hours they average, I was impplying (or they were assuming) that I'm not a hard worker and wouldn't be willing to "get the job done."

How do we appropriately find this balance. How could Farrah tell her boss that it's not ok for him to call her at midnight. She's been working there less than 2 years. Has she proved that she is a hard worker? When can we have this discussion? Can we set this up when we are first hired, so there is no confusion? Or do we have to let our bosses call us at midnight a few times, prove we are hard working and then draw some lines?