@SaneTop and your Inbox are actually two different Inboxes. At any given time, you should only be checking one of them. If you have five minutes before a meeting, check @SaneTop. Check your Inbox as often as you used to check your non-Sane Inbox.

Any email important enough for you to read if you only have five minutes to spare is also important enough for you to read whenever you are in an Inbox mood.

After you read an email (and delete, archive, or file it), SaneBox will take care of removing it from all Sane folders so you don't end up reading the same email twice.