Hi
“Quick Wash” is merely a function not a wash cycle.
If you look here http://www.ukwhitegoods.co.uk/downloads/ise/ci555whuserguide.pdf
on page 12, you will see that not all wash cycles permit “Quick Wash” selection, but the ones that do can be seen and their estimated duration is shown in its respective column.
It is quoted as being about 30-40 minutes but I don’t have actual figures for that. It is also only available on cottons 90/60/40 and synthetics 60/40/30 and obviously each would be affected by the heating time.