Four hands is two therapists at one client's door at once, billed at EUR 360 an hour, sold by the hour alone and always secured with half in advance.
Two women. One door. One client. Four hands is the old spa name for it, and in body-to-body the name undercounts, because hands are the least of what is working.
Two therapists cost EUR 360 an hour, double the single rate. Two hours come to EUR 720. Three hours come to EUR 1,080. That is where the pair's arithmetic is published. There is no overnight for two, so do not ask the thread to invent one; plan a long evening in hours instead.
Every pair books with half up front. First booking or fiftieth, tonight or next month, no difference. EUR 360 goes ahead of the two-hour pairing and EUR 540 ahead of the three-hour one. The reason is plain arithmetic of a different kind: acceptance closes two diaries in one move, and two sets of requests for that window are turned away. Cancel, and the half stays with the house.
People mix these up. Four hands is one client with two therapists. Two clients sharing a room, each with a therapist of their own, is another booking with another shape. Say which one you mean in the first line and the office will not have to guess.
Name two therapists, or name one and leave the second to the office. Give the length in hours. Mention the bed, because a pair needs to move around both long sides of it, and a double wedged against a wall makes that hard. A little more heat than you would set for one is sensible too.
The format has its own four-hand page, the journal reads it as a duet, and the half ahead is explained under deposit.