If it was a self contained mobile unit it probably had a decent generator to power a heater (or might even have been petrol or diesel fired). Then it would need a lot of fan power.
If they put the peak of the parachutes on the ends of the beams and pulled them out tight (probably had ropes through the holes so they could haul them up and down), with a couple of chutes on each beam about 24 could be run through in a sitting.
With stakes for stretching the chutes and a huge tarpaulin to go over the top (no good drying out in the rain!) and maybe a big stack of folding packing tables, I don't thnk it would take long to get to 20 tons. It might even have had a big circus tent to go over the lot creating an efficient huge drying oven.
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