Hi Fred,

#INTERVAL is the exposure time in seconds. The time between exposures (in the absence of some #WAIT... directive, is just the time it takes to plate solve the image, reslew if needed, and perhaps downloading the image from the camera. I have a small format camera (SBIG ST7), so for me that between-time for all that stuff is 10 to 12 seconds.

Plans must have a COUNT, INTERVAL, BINNING, and FILTER (if you have multiple filters in a filter wheel), plus optional other things like REPEAT or SET...