It depends a lot on the question you ask, who happens to be online (and how busy they are) and a whole host of other things.
I've answered questions after a couple of days and the topic has ended up with many posts, others get answered in minutes and never go any further.
It's honestly nothing personal.
There are a group of friends on here, much like any group where there are a lot of people, but any attempt to leave people out is frowned on.