I'm using genuine Yokogawa chart paper on the µR10000 and µR20000.How many millimeters is 1 scale square on the chart paper’s time axis?

The scale intervals on genuine Yokogawa chart paper are as follows.
μR10000: 10 mm
μR20000: 12.5 mm

Note, the chart speed upon shipment from the factory is 20 mm/h for the µR10000 and 25 mm/h for the µR20000, which means 1 square is equivalent to 30 minutes.