I have been working hard trying to understand what in the world is the logic for this expression. After having Twitter post once a minute for 90 minutes, and a ton of frustration, I want to know a bit more about this so I can use it properly. I also dont undestand how to change the presets on the right. Some of them are not helpful for me.
Can I get a few examples to auto post:
on the Second Friday of every month
Every 5 weeks
Every 26 days
Is there a "Repeat 10 times only" feature (10, or 20 or 3)
A repeat expression is based on cronjob expressions. They are powerful ... but not so expressive as you are looking for.
From your examples...
Second Friday of every month (9:30 am): 30 9 7,8,9,10,11,12,13,14,15 * 5 *
There is no way to count N times for every X. So, it is not possible to implement "Repeat 10 times only", but you can define a repeat until a date (so, you can calculate how many times is repeated until that date).