I think several weeks a year is ok. They need time away, they need to recharge. I am ok with them not responding to clients then too, they need to step away and clear their mind from work like everyone else does.

My T did a 2 week and it was hard BUT mostly because he told me literally the evening before he was leaving so I was just hit with the shock of it all. I did better than expected by writing him letters and just staying busy. Reminding myself that he was struggling with things too and he needed this time to himself for his own well being. So it made it easier.

I would say a month's worth at least over the course of a year is good. What yours is doing seems way to much, 13-15 weeks. Yikes!