Scaling - Sensitivity (uV/mm)

I am also looking for the timebase function. I have a question to better understand it. I saw also “mm/sec” used interchangeably with “sec/page”. Quoting from a research paper “…with a paper speed setting of 15 mm/sec or a screen display of 20 sec/page…”. So it is about how many seconds we display on the screen? It could be easier to develop in this way?