I notice that the documentation for
wp_schedule_single_event mentions the following:-
The action will fire off when someone visits your WordPress site, if the schedule time has passed.
However this does not seem to be true for scheduled posts. I notice that some posts can be missed if wp-cron is not run for a while (not sure of exact timeframe). The post then has the label 'Missed Schedule' in the admin panel.
My questions are:-
Is this just for scheduled posts or all scheduled events?
What is the timeframe in which wp-cron must be run before scheduled post are missed?
Where is this timeframe set in the code? I cannot seem to find it in wp-cron.php, cron.php or post.php.