Truth be told I no longer have an analog clock or watch. I downloaded some software that emulates an analog and used that. I have used two different programs. One of them has the minute hand move a bit forward at about 20 second intervals, the other has the minute hand move at one minute intervals. I found this exercise easier with the one that moves a bit as the minute passes, as it seems to provide some interest. I found with the one that moves after a minute, I am more likely to drift off. I have decided to keep using the more difficult one, as it exercises my mental muscles a bit more.