Once a day is fine if that is how you feel comfortable going ahead with it. In my own opinion, I feel that consistency is key to keep it integrated in your system with new energies. If that is once, twice or thrice a day that is up to you, but I would use it every day for two to three weeks (maybe more) at first, and then if you like every second day from then on. That’s what seems to have worked well for me so far with all aspects of energy fields to have the field integrated fully, then when you feel like its integrated fully, a maintenance of once a week should suffice or whenever you feel like you need to use it again.
Of course we are all different so times may vary for some but this has been my method of use since I fully got a grasp on this wonderful world of energetic fields There was a lot of trial and error on my part over the last year and a half of using fields, but I’m very happy with where I am at now
I hope this helps some bit