https://youtu.be/eV6Zko9tdsI
This video shows de icing at Leipzig, an aerodrome I am very familiar with. It would take two rigs about 5 mins to de ice a 757, and ten to ant ice as well.
Manchester de/anti ice yesterday was in the region of 40 mins with out of date de ice trucks. The poor chap doing the de icing had to manually hold the hose.
I guess you get what you pay for.