There is no right answer. What we can say, however, based on our own experience is that during high season (April – October) it is more difficult to book in short notice. However, we can accept reservations until 24 hours before (we do not have the obligation to accept any booking since according to our general conditions we require a notice at least 48h prior to the tour), sometimes even less. Nonetheless when we get a last minute reservation for the day after, we can not always guarantee availability. The best thing to do is to make a reservation a few days in advance or even weeks before the tour.