We have just used a washing machine, one of a set of three outside a supermarket in France. It took 47 minutes (precisely) and because they were industrial washers they spun the washing nearly dry, just needed a bit of airing. We used the 18 kilo load machine( there was also an 8 kilo machine) as we had the bedding from 6 beds plus towels, but a couple of families could share a load.
I know it is a cliche to say see life in solutions not problems, but when anybody introduces any idea that would ameliorate any of the problems facing the work, you can virtually guarantee that someone will pour ice cold water on the suggestion 'because it will affect the poorest in society'.
I am with most people in seeing poverty as a problem that has to be eliminated, but, I wish those saying it would think round and suggest possible solutions. Landfill rubbish is a major problem in almost any country, nappies form a significant part of landfill and do not rot for hundreds of years. A solution needs to be found whether people are poor or rich.
I have seen a few of these in the UK and here are still lauderettes around. I used one to locally to wash a duvet.