It depends on the complexity of your question and how you asked it. The more complex it is, the less likely it will get answered, therefore making the average time longer. If you worded it oddly, it will also lengthen the average time.
Any time is the best time to ask a question on WikiAnswers.
Go back to the question, and select "Improve Answer".
all the time!
Yes. For example: "About what time did you decide to ask this question on WikiAnswers?"
This site gives plenty of information. You may have WikiAnswers confused with a search engine! A search engine will give you instant responses. WikiAnswers will give you a more thoughtful answer, but it takes time for someone who knows the answer to get to your question and answer it.
Pretty much anyone would take the time to improve WikiAnswers, such as yourself, because merely asking a question is spending time to improve WikiAnswers. Everyone you see on WikiAnswers spends their time improving WikiAnswers - otherwise they wouldn't be here.
View the question history and it will list the time (minute and hour) the question was answered.
You would go to the question history for that question and check the log.
See related question below.
The term for the average time it takes for customers to pay you is the average collection period.
A good percentage of the time, yes. It depends on who is answering your question, or how well the question is asked.
Quite a long time, but they do get answers adventually.