With Tom Cruise, time is always of the essence. In language learning however, we have time. Start making your own cards as soon as you feel comfortable with the sounds of the alphabet (and for some languages) the alphabet itself. For languages like Spanish, this may happen after just a few days or a week. For something like Arabic, that'll take a bit longer, maybe 2-3 weeks.
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.