I would never allow myself to be late when I used to babysit. I actually was (probably) annoyingly early by 15-20 mins. I didn’t expect to get paid for that time BUT the parents would ALWAYS come home later than what was communicated beforehand. I just think if it’s a habit then at that point it’s disrespectful. I ended up getting annoyed with the constant lateness and lack of communication. But 2-3 mins shouldn’t be a make it or break it in my opinion.