Overnight before an early flight
An overnight means eight hours for one guest with a single therapist at one fixed fare, the block travellers use between a late landing and a dawn departure.
For a hotel guest an overnight is simply a night. For a traveller it is often something narrower: the eight hours between a late inbound and a morning outbound, or the gap a rebooked connection has just opened. The house prices that block as one format. It runs eight hours and, for one guest with one therapist, costs one fixed sum, with both the start and the end written into the confirmation so nobody is unsure when it ends.
Setting the end time against the departure
Plan an overnight near the airport backwards from the flight. Take the time bag drop closes, subtract the shuttle ride or the walk from the hotel, subtract a busy morning at security, and what is left is the latest the eight hours can finish. A departure at 07:10 with a shuttle at 05:00 points to a start around 21:00 the evening before. Put that arithmetic in the first message and the hour agreed with you will rest on it rather than on a round number. The guide to an early flight from Schiphol works through several departure times.
Half ahead, half at the door
Every overnight carries a deposit. Half of that sum is paid ahead by card, or by Revolut, Wise or crypto if you prefer, once the hour is agreed in the booking conversation; the other half is paid on arrival. The price is in euro, and if that second half comes in another currency, the exact sum in it is confirmed to you in writing before she sets out.
A night given up is measured on the notice scale rather than written off. With more than twenty-four hours still to run, not a cent of the deposit is kept. Inside the last day, before she has left, half of it is kept as fee already earned. Once she is on her way the full deposit counts as earned, unless another client takes the night, in which case it is repaid. A moved flight follows the same scale, and if you can show the house lost less than it kept, it keeps less.
Why eight hours is priced whole
Hour by hour, seven hours on the ladder already cost a little more than the full eight. The fixed figure reflects a night given to one booking and the following day rearranged around it. The night also comes in larger versions: a couple sharing one therapist pays twice the single figure, a single guest with two therapists pays eight hours of the pair's hourly rate, and a couple with two therapists pays double that again, each confirmed with exactly half of its own figure. The overnight page covers the format in more depth.