I'm aircrew on KC-130's in the Marine Corp. and I'm gone 2-3 weeks out of the month. I have my lights on timers. My 55 gallon South American community tank has an automatic feeder with flakes, shrimp, and pellets in it. However my 125 tank is up to my wife, bless her heart. She drops frozen foods in there twice a day once in morning and once at night before lights go out. As far as water changes go, they wait until I get home. I always do water changes the night before I leave and the day I get back. Sometimes when I'm gone for months at a time my wife is capable of doing them, but it is my hobby and I don't like to put that on her. Plus I over filter as much as I can... I also underfeed, less waist. With out my wife though I'd say it would be about impossible.
I had a breakout of angel fish disease one time when I was gone for a month and I talked my wife through the whole thing, she even set up a quarantine tank on her own.
And jcardona1 is right it is a great way to get you significant other in the hobby. My wife picked out everything in our 125 gallon. She said she wanted an Arowana so we got it, and she just ask's me what will be compatible with her other fish, its great. So MFKing is possible with travel. Wouldn't recommend it though if someone isn't around for emergencies etc...