The arrival window, and why the weather leaves it alone
The arrival window is the forty to sixty minutes between an hour being confirmed in writing and a knock at your door anywhere in central Amsterdam.
It is a window rather than a time because a journey across a small city has a handful of moving parts, none of them dramatic and all of them worth a few minutes: a building with a locked street door, a lift that wants a keycard, a reception that prefers to walk a visitor up. Forty to sixty minutes covers all of that with room to spare.
It does not move for the season
Guests ask about this more often in January than in June, and the answer is the same in both months. A hard frost does not widen it. Driving rain does not widen it. A hot still evening in the middle of July does not shorten it either. Amsterdam is compact, journeys inside the ring are short, and traffic here is a smaller factor than in almost any comparable city. The one honest caveat is that the window starts when the hour is agreed, not when you first write, so a thread that takes fifteen minutes to settle the details has used fifteen minutes.
What to do with it
Plan against the far edge rather than the near one. If the window opens at eight, be ready by nine rather than by twenty to. In the cold months that is exactly the stretch in which an old radiator does its work, so the window and the warming of the room happily overlap. In a hot week it is the stretch in which an opened window and a drawn blind bring the temperature down. Either way the time is not dead time, and a room that is ready when she arrives turns the booked hour into the session rather than the recovery from the journey.
Outside the centre
Schiphol and the hotels around it are not inside this figure. That journey is agreed as its own thing, with a realistic drive time confirmed to you in the thread before the hour is held. Schiphol by arrangement sets out how that runs.