Back in the days of using crystalising shampoo to maintain the Sky call centres (9 of them nearly 20 years ago) we would extract once a year.
We dreaded it every time. Complaints about noise, smell, slips, trips all by staff who don't want to be there in the first place and looking for any excuse to go home, claim or have the opportunity to moan at someone rather than being moaned at themselves.
We actually had a request to not put wet floor signs out as staff were finding them a nuisance as they would trip over them walking from one area to another reading paperwork!!
Since we moved to polymer encapsulation products we find we don't need to machine rinse everything once a year.
Some areas still need a flush through but maybe only 5-10% of the total area and they are usually stairs to the first floor, tea points, entrance mats, some canteen areas and lifts.