An hour sounds like a generous amount of time. Held against a diary it is an evening. Held against this particular format it is tighter than it looks, and the reason is worth laying out plainly rather than presenting the longer booking as an upgrade.
The arithmetic
Start the clock at the door. Some minutes go to arriving properly, coming in, putting things down, the short conversation in which she tells you her limits and asks about pressure. That conversation is not overhead. It is the thing that lets everything afterwards proceed without being negotiated in real time, and hurrying it costs more than it saves.
Then there is the period at the beginning where a body is present but has not yet settled. Nobody walks in already unwound. Breathing is still short, attention is still on the day, and the first stretch of work is doing nothing more ambitious than letting that pass. It takes as long as it takes, and it does not take five minutes.
At the other end, the pace needs a few quiet minutes to slow before the time is up. Cutting those minutes short undoes a surprising amount of what the preceding hour did.
Subtract the settling and the slowing down from sixty minutes and the working middle is considerably shorter than the booking. For a massage with an objective that is fine, the objective gets served. For a format whose entire method is refusing to hurry, the middle is the whole thing, and it is the part that gets squeezed.
What the extra half hour buys
On the ladder, ninety minutes costs half as much again as a single hour. That extra half-hour's fee does not buy thirty minutes distributed evenly across the session. It buys thirty minutes of middle, because the settling and the closing cost the same either way. In practice the working part roughly doubles.
That is why the recommendation is consistent and why we make it before you ask rather than after. Two hours is the other common choice, and it changes the character again: at that length the session stops having a shape you are aware of.
Beyond that the ladder is simple. Three hours is three times the hourly fee, and each additional hour past three adds that fee once more. Two therapists on one client cost twice the single rate at every length, and a couple with two therapists pays double that again. The overnight format runs eight hours with one therapist, at a block price rather than an hourly count. Four hands through the night carry their own night figures, one for a single client and one for a couple. All of it is set out in the rates table on each therapist's profile, and none of it carries a night, weekend or travel surcharge inside the ring.
When an hour is the right call
It genuinely sometimes is. If you are between things, if there is a morning that starts early and you know it, or if this is a first booking and you would rather find out what the format is like before committing an evening to it, an hour is a reasonable way to do that. A short session done honestly is better than a long one you spend watching the time.
The one situation where we will say something is when the format chosen depends on length to work at all. The lingam and yoni formats both rest on a long approach, and compressing that approach into an hour changes what they are. If you book one of those for an hour, a therapist will likely mention it. Not to sell you the longer slot, you can decline and the session goes ahead, but because it is the kind of thing you would rather be told beforehand.
Sessions are outcall, to your hotel room or apartment across central Amsterdam, arriving forty to sixty minutes after confirmation, at any hour.