To be effective you need to use Anki every day. I set my goal for learning and reviewing ambient knowledge at 30 minutes per day. All ambient cards are organized under one “Daily” deck. If studying that deck exceeds 30 minutes, then I reduce the number of new cards added per day until it goes below the threshold.

For knowledges that I’m actively learning, I keep separate decks and have no time limit. Creating, splitting, and tuning cards is fundamental to my learning process.