It totally depends on the person. I, for one, respond immediately and usually they are fixed within a couple of days. Same with cgwm808 (okay, she’s much busier than I am, so let’s say within the week).
There are many very diligent people here, and yes, the bad apples as well, who won’t care - or maybe they are long gone and they don’t reply because they don’t visit Viki anymore. Maybe they won the lottery, maybe they married and had kids, or maybe they died - we will never know!