We go away for as long as two weeks at a time. When I decided to go ahead and have chickens I designed everything chicken with that in mind.
I built the wooden bin feeder that I found here on the forum. Right now I am out of town for the next 9 days, and there is 150 pounds of feed in the bin (for 8 chickens). Ought to hold them for a little while.
I have two large hanging waterers filled to the tippy top.
When I built the coop I put in an automated door from the run to the coop, so that the girls could put themselves to bed at night and be locked up safely.We have some pretty big raccoons in our area, so our chickens can't stay out at night.
I hired my friends teenager to go by every couple of days, and give them a treat, and check their water and food.
My situation is probably more extreme than yours because I travel a lot, but it is possible to leave them alone, if you are willing to take a couple of extra steps.
At least it has been possible so far!