At Bandit's age, a few days shouldn't be a big deal at all. I'd just provide a good meal of bugs before you leave and provide a nice big salad in the tank for him to work on while you're gone. If you are gone for more than 3-4 days, I'd have someone stop by to let him out for a while, refresh his salad, clean the tank if needed, etc. I've never had problems leaving them on their own for a long weekend though.