nav_poll in IMP 2.3.7

[Paul Juliano]

In ~imp/config/prefs.php:

# folder navigator options
# javascript popups, and expand folder tree by default
nav_popup, 0, 0
nav_expanded, 1, 0
nav_poll, , 1
refresh_time, 0, 0

What value should I set the nav_poll to in order to have all folders to
be checked for new mail.  Currently, I have to click on a folder then 
select 'Check folder for mail'.  And I have to do this in every folder 
I create.

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