The timing of when questions appear in the review quiz changes based on the stage

• 0: Appears in the review quiz immediately
• 1: Appears in the review quiz immediately
• 2: Appears in the review quiz after 6 hours
• 3: Appears in the review quiz after 20 hours
• 4: Appears in the review quiz after 60 hours
• 5: Appears in the review quiz after 7 days
• 6: Appears in the review quiz after 15 days
• 7: Appears in the review quiz after 30 days

The stage increases by 1 when you answer correctly and decreases by 1 when you answer incorrectly. In regular quizzes, the stage does not increase beyond stage 2.