Generally, orders go out on the next business day. We try to get the overnight orders out the same day but it is not always possible. On some rare occasions, it can take longer. But that is the exception not the rule. We do try to put a note on the web site when this happens.
Also, for UPS ground, orders made on Friday won't ship until Monday since UPS doesn't pick up ground on the weekend.
If a shipment is mission critical for an install and needs expedited handling, I would suggest calling after you place the order to make sure we are aware of the situation. But please only do this when it is critical, not just convenient. I would prefer to keep the order fullfilment process as laid back as possible. It should be a rare case that we need to expedite. Proper planning and patience by you makes our job much easier and fun!