How often should the cron job be run for e-mail notifications? Am I correct in thinking that the cron job must run at least as frequently as notifications should be sent out?
For example, if I set the notify_min_span to 1, but the cron is set to run every 3 minutes, then the fastest time between when a user updates a task and when the notification is sent is 3 minutes?
Yes, emails can only be sent as often as the cron job runs. When the cron runs every 3 minutes, the maximum time before the notification is sent is 3 minutes.
Regards,
Michał