Quote:
‘Cross-country’ means a flight between a point of departure and a point of arrival following a pre-planned route, using
standard navigation procedures.
So no minimum distance.
I opine that "standard navigation procedures" could not be begun over a distance of less than a few miles in a straight line. You need at least this to establish your planned heading, and then find the necessary geographical references to assure that you are maintaining it. At least one checkpoint confirmed passing on your flight log. I would not be content with a "cross country" where you maintained visual contact with the runway from which you departed.