I use about 15 orgmode agenda files, and a number of them I use passively only. Examples are my wife's agenda converted from Google calendar, a work agenda from Outlook and a list of git commits (which gives you the idea that you actually did do something today). All are periodically updated outside emacs, usually by a cron job.
My problem is that reloading my agenda view does not (always) seem to reload these files, and often the only way to find this out is to try and edit an entry, at which point emacs will indicate that the file was changed and can be reverted. The file is then reloaded by emacs, and pressing 'r' in the agenda view gives the updated entries.
Is there a way to have emacs regularly (e.g. every hour) reload selected agenda files, so that the info in my agenda is uptodate? Alternatively, doing such a reload when pressing 'r' would be fine too.