You can determine how aggressively SaneBox moves unimportant emails out of your Inbox.
The magic of SaneBox can decide what Inbox email belongs in your new SaneLater folder. This will give you the cleanest Inbox and is great if you are drowning in email.
If you would rather decide what goes into SaneLater, then all emails will stay in your Inbox until you train SaneBox to send them to SaneLater. Consider this option if you consider most emails you receive to be important.