A slight twist on the original question...
If you go out on the lake and you go down for 20 minutes navigating to an underwater site, then surface to get bearings on the next site, then navigate again 20 minutes, then surface to go to the next - would you count it as one dive or three?
No
Personally, I have to leave the water and re-enter for a second dive.
Dive has to have a certain ammount of duration and depth but those are flexible.
I did not log the drop to 60 ft and unhook from the wreck.