Valid unanswered questions will stay on the site forever, so they can be answered.
Invalid questions, questions which break the rules or the law are deleted by Supervisors.
Unanswered questions are generally left on WikiAnswers indefinitely, unless of course they violate WikiAnswers' policies.
You can't delete any of your questions or answers if you haven't registered. When my question has upvotes and unanswered for long time, it get deleted.
"Featured" questions are unanswered questions that Supervisors feel are interesting or important; it gives them more visibility, perhaps because they have remained unanswered for a long time.
Some post questions that are not important in their kind of what people are searching for. I suggest you send important questions(highly educated questions)so people could see it. If it doesn't work, ask your friends to answer your questions. I help people's unanswered questions because I don't want them to wait for a long time just for their question to be answered.
Go to wiki.answers.com. Then click new questions. All the unanswered questions will show with how long ago they were posted.
Some unanswered questions about the rainforest are: how many animals live in the rainforest, how many different species live in the rainforest, and what is the largest or smallest animal that lives in the rainforest.
It could be: "How long does it take for an animal to be endangered?" or: "How long will it take for house pets to be endangered?" The world may never know...
If the question is clear and simple, under a minute. There are thousands of people watching the"unanswered questions" list who leap to answer them.
Not all - since there are new questions being added all the time. Additionally - some questions may stay unanswered for a long time - depending on the subject - and whether someone knowledgeable stumbles on it.
Archive Researchers tackle questions that have sat unanswered for long periods of time. Some of these are more difficult questions and require some research. They may recommend that the more interesting selections become Featured Questions.
Not really much as you can see the long list of unanswered questions. It could take maybe a week or two, depending on how common or strange your question is.
This varies from question to question. Sometimes less than 1/2 hour, sometimes 3 weeks. My suggestion is to not ask non-valuable questions.