How to set-up multiple cron task with wp_schedule_event so that they do not overlap?

Ok that was pretty easy

// Set the CRON for pages
wp_schedule_event(  current_time( 'timestamp' ) + 450, self::FB_CRON_FREQUENCY, self::FB_CRON_PAGES, array( Ai1ec_Facebook_Graph_Object_Collection::FB_PAGE ) );
// Set the CRON for groups
wp_schedule_event(  current_time( 'timestamp' ) + 900, self::FB_CRON_FREQUENCY, self::FB_CRON_GROUPS, array( Ai1ec_Facebook_Graph_Object_Collection::FB_GROUP ) );
// Set the CRON for users
wp_schedule_event(  current_time( 'timestamp' ) + 1350, self::FB_CRON_FREQUENCY, self::FB_CRON_USERS, array( Ai1ec_Facebook_Graph_Object_Collection::FB_USER ) );

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