[ceph-users] Limits on the number of cephx keys used

Hi All As far as I can see, there is no guidance on the number of cephx keys that can be in use at one time. Is there a number at which ceph becomes much slower e.g. 100, 10000, 1000000? I'm wondering how best to manage keys across many clients (let's say 1000s for now), most of which won't actually be connected at the same time. Regards James