Some advice is good even if it’s not necessarily precise. Just the common sense behind it is enough to be worthwhile. Here is one example: A while back, an article on email management stated that if you opened an email message and decided you could deal with it in two minutes or less, then do so immediately and get it out of your Inbox. I can’t remember where I got that from but I’ve been using it ever since and it’s helped me a great deal in managing the size of my Inbox.