I've had issues with this in the past. I've tried several solutions, including editing the database values of the actual number of seconds, to edit the frequency of times tasks run in the task scheduler via curl. As well as fixing up max execution and...  moreI've had issues with this in the past. I've tried several solutions, including editing the database values of the actual number of seconds, to edit the frequency of times tasks run in the task scheduler via curl. As well as fixing up max execution and max input times to mirror the setting -1.
What I've discovered, is that there are times, in Social Engine, where the task just stops running. It times out on its own, even when it's set never to do that. Curl for some reason, will randomly disconnect the task of running mail. by default, Social Engine makes the mail task run every 15 seconds. I changed that to run every second. That way the mail is sent out as instantly as possible. I also updated some of the other tasks, including decreasing the number of times jobs are checked, from 5 seconds, to 1 second as well. I made updates to how long a task can run without fail, to ensure that on the hour, every hour, the task is run again through enforcing max input time and max execution time was set to 3600...    less