Hello, @merrika67 and
I think this is a good thread for newcomers (it offers many links and answers too):
Daily, ideally, although not absolutely necessary.
You might have results even if you listen every second day or so, but daily listen is best listen.
At least 10 minutes of listening per field is usually good enough.
Also, for your other/next question:
Also, There are also fields which help you have faster and better results, like Kinetic Quasi Crystal.
For any other questions, feel free to use the search function 
(or just ask the forum).
Have a Pleasant stay around here. 