Actually I disagree you should wait until you come back, a good practice is to avoid feeding prior to leave town, why you might ask? Well while it is not likely to happen a regurgitation is still a possibility with a snake and trust me this is not the kind of you want to come back to should it happen in your absence.
Your snake will be fine waiting and trust me better be safe than sorry.
When I leave the last time snakes are offered food is a least 7 days before departure and if they don't eat they'll have to wait until I return.