It is short notice, but it doesn't matter! It's YOUR business. You do not work for him...you own a business that provides a service on YOUR terms. That kind of attitude and ordering you around would certainly not fly here and would be grounds for termination. Who the F does he think he is, telling you that you "better be here". So, you're not going to be, so what is he going to do, give notice? Beat him to the punch and if he shows up, answer the door and hand him a letter of immediate termination due to blatant disrespect, and failure to comply, then shut the door. I really wouldn't stand for it.