Random Cron Job Command

I am running wordpress with wp O matic. I want to update my content after 24 hours (but different time each day). Bottom line is I want a cron command which randomly execute after 24 hours instead of a particular time.

For example currently wp o matic shows the following command the following command, would you please advice how i change the this command to achieve the above results (right now wordpress is running on my computer so following thing is just for example)

*/20 * * * * F:Testlogwp-contentpluginswp-o-matic/cron.php?code=8b935355