OT Do you think you can save a spot in a parking lot by standing in
it, until your friend brings the car?
If yes, how long can you save it?
Sure, my wife does this from time to time.
As to how long you can stand there, if it's private property, I suppose you
can stand there until someone complains to the owner and the owner elects to call law enforcement to have you arrested/removed as a trespasser. If it's public property, you can probably stand there until someone complains
directly to law enforcement to have you arrested/removed as a trespasser.
As a practical matter, you can probably stand there in plenty of time for
your friend to arrive and park in your spot since I doubt if most law enforcement people would consider this a priority issue. On the other hand, anyone upset over what you did could very well decide to vandalize the car
in retaliation, which is one reason I don't really like when my wife does