Every night of the week is bookable and none of them costs more than another. What differs between them is not the arrangement but the traffic, and Saturday has the most pronounced shape of the seven. Understanding it is worth more than any general advice about booking late, because it tells you exactly when to write.
The evening, from the thread's side
Saturday messages start early and cluster. A first wave lands somewhere around seven, usually for bookings later that night, and those are the guests who have decided in advance. A second, larger wave arrives between eleven and one, which is where the majority of the night's bookings are made. By two the volume has dropped sharply, and what comes after that is steady rather than heavy.
The practical consequence is counterintuitive. Three in the morning on a Saturday is often easier than midnight on a Saturday, because midnight is the peak of the second wave and three is past it. The hour that feels most improbable is frequently the least contested.
What the roster is doing
Forty-five therapists, each choosing her own hours. On a Saturday more of them keep late hours than on a weeknight, so the group working at two is genuinely larger. That helps, but the demand rises further and faster than the supply does, which is why the second wave is the constraint rather than the hour.
So the advice for a Saturday inverts the usual instinct. If you want a particular therapist, write early, before the eleven o'clock wave. If you simply want a good session and do not mind who comes, writing at half past two is a perfectly sensible plan and is often better than writing at midnight.
The building is busier too
Saturday is the one night where the quietness argument weakens. Corridors that are empty at two on a Tuesday are not empty at two on a Saturday, and a lift on a weekend night in the centre is a shared space until quite late. None of this creates a problem, but it changes the arithmetic about which hour is the discreet one. On a Saturday it is later: three, rather than one.
Entry details matter more as well, because more buildings are managing more people. The street door, the keycard lift, the night entrance, all the ordinary cases in the night entry note, apply with more traffic around them.
Length, and the honest question
Saturday produces the most optimistic bookings of the week. A guest who has been out since eight in the evening orders three hours at two in the morning, with genuine enthusiasm, and then finds that the evening had already used most of what was available. That is not a disaster and the session still works, but it is worth a moment of honesty before choosing a rung on the ladder.
The reliable Saturday booking is ninety minutes or two hours. Three hours is a better fit on a night that has not already had a night in front of it, which usually means a weeknight or an early Saturday start.
The Tuesday comparison
The same booking on a Tuesday at three is a different experience in every respect except the fee, which is identical. The roster working that hour is smaller, so the choice is narrower, but the demand is much smaller still, so getting an hour is easy. The building is genuinely silent. The guest is usually less spent, because Tuesday at three is rarely the end of a long evening and more often the middle of a wakeful night.
People who book regularly at night tend to drift towards weeknights for exactly these reasons. It is quieter in every sense, and nothing about it costs less or more.
Peak Saturdays
A handful of Saturdays a year are not ordinary Saturdays. King's Day weekend, Pride, the Dance Event, the last weekend before Christmas. On those, half the fee goes ahead on every booking, including the same-day ones that would otherwise be paid entirely at the door, and the roster fills hours earlier than usual. The fee itself does not change, and the peak date entry lists what qualifies. On those nights, the early message is not an optimisation. It is the whole strategy.