The mix used here was 5 bags of coarse sharp sand and 1 bag of snow crete and water was replaced with sbr bond mixed 3;1 with water ,bonding slurry is white cement with sbr bond mixed to a creamy consistency with a couple of hand fulls of spf adhesive to slow the slurry down from drying out,bonded to a concrete base you can go as thin as 25mm bed and polymer enhanced you can go as thin 15mm, unbonded on pvc sheeting over a solid base I go to 50mm minimum bed depth and reinforce it with chicken wire, over insulation I keep it to 60mm.
24hrs before light foot traffic with opc but you can get cement from Mapei and Ardex that will take heavy traffic within a few hours