From what I know, new boards come pre-waxed already. So you should be fine for a couple of days. It also depends on what conditions you are riding and the temp of the snow.
My Rome Agent came pre-waxed, but the first time out was in mount hood during May, the snow was very rough and sticky and it ate through the wax in the first couple hours. For the next the Snowolf had to put some black summer wax which lasted much longer and gave the board a better feeling.