Harry - be a cleaner for some time in private houses
I worked one summer clearing out an old factory (and warehouse space): harder work (heavy stuff to lift), dirtier (the place hadn't been cleaned for years) and more dangerous too (sharp things all over the place and god only knows what waste products were in there).
Your cleaning lady works at your place, plus probably in some other. Add her time to get from place to place.
She mostly works full days and so travels twice per day (just as everybody else who works does). I very much doubt she works in more than two places in a day.
Cleaning a 150 sq.m house in four to five hours means you are doing a very shoddy job, which might explain why you were only being paid 3.85zl per hour (50zl per day (i.e. 200zl per month) for a 13-hour day is 3.85zl per hour). My flat is about a third of the size you claim that house was but my cleaner sometimes takes four hours to do it (if there is a lot of ironing). She does a good job and that might be why she earns more than five time more than you claim you did.