When we went away for two weeks recently we arranged for someone to keep an eye on Monty and top up his water etc but he wasn't fed - it did him no harm at all.
I also can't see the harm in channging feeding days around a bit - after all nature doesnt run to schedule. I feed Monty on the weekend - thats usually a Sunday evening but saturday Friday or even Monday evenings are fair game tooI wonder what the old hands think about this point, but I can't see the snake fussing