Overnight, the eight hour block for two
A fixed block of eight hours with both ends written into the confirmation, quoted as one sum for the night instead of a meter left running.
Overnight is a format with a fixed length rather than a mood. Eight hours, with the start and the finish both written into the confirmation so that nobody is working anything out at five in the morning.
The four versions of the night
Two guests with one therapist, two guests with a therapist each, one guest with one therapist, and one guest with two therapists: each version carries its own block sum, and the profile of the woman you choose sets all four out against her name. Half of whichever applies goes ahead whatever the notice, because every eight hour block carries a deposit.
What it is not
It is not eight hours of massage, and booking it on that expectation is the one way to be disappointed by it. It is a long unhurried night in which an arrangement is part of what happens rather than the whole of it, with sleep somewhere inside it.
Where it fits on a reunion trip
On a night with a free morning behind it, which on a three night visit means the middle night rather than the last. Two departures on a Sunday morning and an eight hour block ending at six are not compatible, whatever either of you feels about it at midnight. Where both flights are genuinely late in the day, the last night becomes reasonable again. The overnight page goes through the hours in detail.
Checking the room before choosing the hours
Ask the hotel for its checkout time before deciding where the eight hours sit, since a block cannot run past the moment the room stops being yours. The hours count from the agreed start rather than from the knock, so arriving back at the room late costs block time instead of moving the finish. A gel format, if the two of you want one at all, belongs in the first hours of the night.