Possible Duplicates:
slow email notification
Instant email alerts and notifications
The option under an asked question says that Notify <emailaddress> daily of any new answers, so it is clear that in case of new answers email will be send on daily basis..
WHY?
In today's world where every site is getting more interactive why is this great helper site not mailing the person who asked the question as soon as the question gets any answers?
This feature would really help, because I think the majority of people here have questions that arise during work, so the sooner they get the answer the better.
Till then I refresh my question's page every 5 minutes or so, :-s