Lisha7 we have to do this all of the time. Here's a tip. when you check in remind them that you have a "continuing reservation" and they will try to put you in a room that will cover both reservations and make sure you will not have to move. You, however, will need to go back to the front desk the next day (I advise early) and get a new keycard to cover the new reservation. We, as CM, are only allowed to have a reservation for 7 nights, so whenever we go for more than 7 nights, we have to have more than one reservation. We have done the continuing reservation more than 25 times over the past 5 years and never had to change rooms. The recheck-in is very quick and painless. We usually do it before breakfast and takes just a couple of minutes. Of course there is always the chance you may have to move, but we never had to yet--afterall, why would they want to strip down 2 rooms when they don't have to.