I am lucky, I guess, to be a part of one of those "breastfeeding couples" so DH has always been supportive of bf from day one...and has encouraged me to continue as long as dd and I desire. I'd like to think that Daddies should always be a part of the discussion but I realize they're not all "liberated men" like my DH.
But getting to your question about "time away"...we took a 3-day weekend away when DD was 9 months old and I was still breastfeeding pretty steadily so I pumped and dumped while away (there was no way to store the milk) and had frozen milk stored at home for granny to use. Now that she is over a year, DD nurses about 3 times a day and has no interest in a bottle (ebm or cow's milk) so I don't pump at work or leave milk for the sitter, but she does nurse AM and PM (and usually when I come home from work). Sometimes I have to travel for work and will pump to relieve the pressure while I'm away, but she really doesn't seem interested in breastmilk unless it's coming straight from mama anymore. She still is able to go to sleep with daddy (or the sitter) and seems to be ok.