Just to clarify things, although the site is hosted by PCA the people who reply to problems are just ordinary members like yourself.
Nobody is paid to sit and answer the problems and it just depends who is logged in at the time whether your problem is answered quickly or not.
I know that at times it seems that the same people reply to most of the threads but they are not PCA members of staff. If your particular problem is not resolved quickly then do not worry as someone will almost certainly reply whenever they next log on.
With almost 175,000 members there is every chance that someone will have encountered your problem before and know the answer.
justme has said it all; you don't know, but in my experience someone always replies, and often within an hour or less. (I posted a problem this afternoon and first response arrived within 30 mins). If you've left a tick in the box that says "you will be notified by email when someone responds" (or some such phrase)that's the way you'll find out. You can then connect to the site and read the response.