There is no general rule how to setup these values. I run my sprinklers every second day with a default time of 30 minutes. The only change I made is to set the humidity base to 65%, which I found more suitable for German weather conditions. You have to play a little bit with the setup to find out what best suits your needs.
It is also a good idea to search the forum for e.g. ‘Zimmerman’ and read through the posts to get some ideas. I’m using Zimmerman since two years now and don’t see any bigger issues. The parameters can be easily adjusted.