Generally, we recommend setting a new cards/ day goal (usually around 30 new cards per day if you want to spend rouuuughly 30 minutes per day studying), and then you can make new cards as often as needed to in order to constantly have a daily supply of cards.
If the card creation seems to average around one minute per new card, we could theoretically do:
30 minutes of reviews every day, and 30 minutes of card creation every day.
30 minutes of reviews every day, and 60 minutes of card creation 3-4 times per week
30 minutes of reviews/day, and 90 minutes of card creation 2-3 times per week, etc.
For example, you might like to do several hours of card creation on Sundays, and then study those cards for 1-2 weeks, then repeat. Later on, you might prefer shorter, more frequent bursts of card creation. Maybe this could work slightly better since there's less of a delay between when you create a card and when you review it.
Note: As of September 12th, 2019, we no longer provide official support for our Anki-based pronunciation trainers and word lists. You are more than welcome to still purchase and use them, but the support we are able to offer for these products is limited. For supported languages, these materials are already built into the Fluent Forever app.