Ageing of threads is there a way ????

Is there a way of increasing the length of time a thread will be marked as unread.

Currently if I move away from the forum to a different browser panel and back again after a few minutes the previously unread threads are marked as read.

So can the length of time to age unread thread be increased ???????

Let's block ads! (Why?)

Ageing of threads is there a way ????