>>2204244Depends on your country. In the UK it's usually fair game as most trespassing isn't considered a criminal offense. Once someone of authority catches you and tells you to leave, it's time to go because failing to do so escalates it to criminal.
Breaking and entering is just dumb because you have no idea who you'll run into or what automatic sensors they have and being caught with bolt cutters is enough for the justice system to throw the book at you.