If your corn is 8 months old, at a healthy weight and is not a regular water bowl defecator than go enjoy your vacation....
It couldn't hurt to throw in an extra water bowl if you really want to. A healthy corn that age can easily go a month or two without eating if it had to.
Also, if your heat source is not on a good quality thermostat and/or you have it rigged on a dimmer or something similar you can unplug it...
Remember, one of the great things about herps is that it's not like leaving a mammal unattended. It will probably enjoy the peace and quiet while you are gone