There is quite a team of people behind the operation of such a large jet. If the owner expresses a wish to go somewhere that they have not been to before, minions start burning up the phone lines (and/or the internet) to arrange the needed facilities. If the airport is sized to accept an airliner of that size, the odds are that fuel, a tow truck, stairs and the other needed appliances are somewhere in the vicinity. If not, they will need to be sourced. As for how long that takes... I don't think there is an answer to that question. The team will know where they can go, where they have contacts, and how to word the message to the owner that the holiday will need to be delayed by a couple of days due to unavailability of facilities.