You can query this information using Data Explorer. I think this should work - you’ll need to specify start and end dates. It should return the topic, the slow mode time in seconds, when the topic slow mode was updated, and who did it:
-- [params]
-- date :start_date
-- date :end_date
SELECT
t.id AS topic_id,
t.title,
t.slow_mode_seconds,
t.updated_at,
u.id AS user_id,
u.username
FROM
topics t
JOIN
users u ON t.user_id = u.id
WHERE
t.slow_mode_seconds > 0
AND t.updated_at BETWEEN :start_date AND :end_date
ORDER BY
t.updated_at DESC