Should I log flights on separate lines if I park the plane between legs to different airports? I flew one leg of a cross country, landed, parked, and turned off my engine. I flew the same plane home an hour later.
Are these two separate flights and should be logged as such, or can they be logged together on one line?
Is there any rule that states how it should be logged?
There are no hard and fast rules in the US about how and when to break up a flight like this, so do what makes the most sense to you.
In the military I would generally log individual sorties on different lines because there were varied mission codes, and sometimes we switched crews.  However, on a multi leg cross country I would log it all on a single line.  (As long as the multiple legs occurred on the same day.)