As long as you have access to your email and your phone/PC etc can notify you about the new coming emails. You don't have to check thread all the time.
First. subscribe to the thread you want to be notified if any new posts have been made.
Second, click User CP->Edit Options->Receive Email Notification of New Private Messages.
Once you have done, you will be notifed whenever new posts was made on your subscribed thread via your registered email on sythe.