people told you is 800-1000 more, but this is how kage treasure worked before 3.0.

before 3.0 you used to get one super rare at 900 and the second super rare at 1800, but this is no more how it works.

Now once you reach the 1000th draw you unlock the superares as common rares and every time you pull an rng lucky draw or you hit the counter you can get them as any other common rares. Very likely you'll get the other superare within your next 4 rare draws (so within 280 more pulls). Beware that is not sure, just very likely. Is sure only if you don't pull early rng lucky pulls and if you pulled before all the other common rares.