Configuration (Drupal 7)

Installation

• Create a new content type, or reuse existing one
• Add a new number/integer field for this content type at admin/structure/types/manage/NODETYPE/fields
• Select the format "Selected answer" for this field in the "Display fields" section: admin/structure/types/manage/NODETYPE/display
• Go to the Q/A settings page admin/config/question_answer and select the content type/field name above.
• That's all!

Question expiration

You can set the expiration time for each question. After this time, the reply with the most votes will be automatically selected as the answer.

• Go to the Q/A content type, create a new field "duration"
• Type: List (Integer)
• Widget: Select list
• In the configure page, enter prefined time in second, for example (unlimited, 1 day, 7 days and 30 days):
  

  0|No expiration
  86400|1 day
  604800|1 week
  2592000|1 month
  

• Select the format "Remaining time" for this field in the "Display fields" section: admin/content/node-type/NODETYPE/display (D6).
• Go to the Q/A setting page, select this field.
• Install VotingAPI module and another module, for example, vote_up_down (don't forget to enable "vud on comments").
• Go to permissions page, allow anonymous to vote on comments.