I posted this question on my local mom's Facebook page, and answers were either never, or 3-5 days. The exception being one mom who left for 2 months to do field research. She describes the experience as horrible. So basically I didn't get the external validation I was looking for. I am about to start medical school and am thinking ahead to away rotations, as well as being heavily involved in our large Global Health program, which requires 4-6 weeks away two separate times.
So what about you mamas? How long have you been away? Was it for work, school, pleasure? How did you manage? How did you feel about it? Would you do it again?