yhea, you can clay today and wax later. It won't really collect anything in that short of a period. I have actually done that before; clay one weekend, wax the next.
Just watch where you park your car. I clayed my car last month and already I need to clay some crap off again. Its spring time and the trees tend to dump weird crap on cars. I've got these little amber dots on the car that aren't sap. Its like some sort of chaff or something.