I have proved by actual trial that a letter, that takes an hour to write,
takes only about 3 minutes to read...

Lewis Carroll

Because of the scale of display of the message and the time-consuming technique of embroidery used, the statement literally takes on another dimension: it seems to refer to the making of the (somehow equally hand-written) typographic installation which took a long time to complete, compared to the much shorter time needed to read it.