Normally below mentioned processes been checked before locking a Fourm Thread:
1. Forum Thread gets appropriate Answers.
2. Forum Thread Creator gets answer and request for Locking.
3. 2-Days in cases of Introduction.
With Best Regards,
Ms. Tania Gogoi
Threads can also be locked when it becomes much older. Whenever, a new message is posted on a particular thread, that particular thread appears at the top of the list in the Forum section. Hence, the new threads get further down the list and might not fall into the attention of the members. Thus, an important thread which may be important or requires special answers may remain unattended or unanswered. So, it is good to lock up a thread when it becomes old or the appropriate answers are received as mentioned by Andy.