What sorts of questions should people ask before choosing a polished concrete floor?

The home owner should consulate with a professional concrete polisher to decide on how much aggregate/stone should be visible.

How long does it take to polish a concrete slab?

What are the most popular finishes chosen from your warehouse?

The most popular finish is generally Full Exposure Gloss Polished Concrete.

What happens if someone spills petrol or turps on a Grind and Seal or a Hyperfloor?

Wipe as soon as possible with a damp cloth.

What is the difference between a sealed floor and a polished floor?

A sealed floor (also known as a Grind and Seal) is machine grinding to the desired exposure followed by a Surface or Topical Sealer just like a timber floor.

When do you add the colour?

Colours are added by the concrete supplier and are in the mix before the concrete sets.

Can I have burnished concrete flooring in a family home?

The quality of a burnished floor comes down to the quality of the concrete contractor. The contractor will typically run a powered trowel or "helicopter" over the wet concrete slab and with experience and care can achieve quite a smooth finish. It is not easy and any imperfection, gouge or non-level area or dip will be very visible in the final concrete floor.

How long does the process take? Polish concrete for an existing concrete bathroom floor 5.73m2

Thanks for your question. There are quite a few variables here and without more detailed information we can only provide you with a fairly general answer.