Flushing the toilet when there's nothing in it but differently coloured water is a waste, but I understand why you have to do it in a social context. I would prefer not to needlessly strain my shitty pipes, but I prioritise other people not needing to know that I piss just like they do.
Anyways, this is a very obtuse way of asking how many times does a person have to come to your apartment before you can shamelessly not flush the toilet after (visibly) peeing?
look I don't care about seeing it but I'm gonna smell it if you just leave it there & I don't want to
if it's your apartment it won't bother me too much. if it's mine I'll cut you down where you stand