I want to record to chart paper about once a month, but what chart feed speed (chart speed) should I set?

The length of the chart paper is 16 m (16000 mm). One month is 720 hours, therefore if you set a chart speed of 16000/720 = 22 mm/hr or less, you can record for a month.

• Pen model: From 5 mm/hr —12000 mm/hr, select 20 mm/h.
• Dot model: In the range of 1 —1500 mm/h you can set 1 mm steps, therefore set 22 mm/h or less.