Quick drying screed - anyone? pigletjohn?

[WhatWillSantaBring]

Anyone used or actively not used a quick drying floor screed. My extensive google research suggests it's the only option for our extension that means we can get the floor down and therefore the kitchen installed without waiting three months for it to dry.

Retrofitting the floor after the kitchen is in will be a real pain due to the style of the kitchen (can't put the kickboards on after installation).

The builder seems unconvinced because his screed suppliers don't have any. Will I be overstepping the mark if I insisted on him using it, therefore changing suppliers? I know it's my kitchen, but he is the one with the industry experience, and I'm clueless?

[PigletJohn]

You mean quick setting.

The water still needs time to dry out.

Is it going on a concrete slab which is either recently poured or has been out in the rain?

[WhatWillSantaBring]

Maybe I don't know what I mean?! There are lots on the market that I mean, flowcrete do one here as do Tarmac here as do CSC here and there is an additive called flexidry (though my builder wants to use a premixed screed). All claim that the screed will then be dry within 1-7 days, and by dry, it seems to claim dry enough to lay flooring on.

75mm layer of screed going on top of a concrete base that was poured in December and has been in the dry since end Jan (though unheated).