[rytis]

OK, but still that doesn't change the equation. 22 secs washing and 8 secs drying is still 30 secs in total, whether it's done separately or not. And as you mentioned, the number of sinks and the number of dryers are balanced, so they combined have a similar throughput. I think you see sink lines more often just for that reason, if the sink line can handle 10 persons per minute, and the supply is 20ppm you will have a queue. But once we throttle people at the sinks, the supply to the driers is 10ppm, thus no lines (assuming the driers line is 10ppm)....