How much slip is ok?

I know that the tranny should slip just a tad and be ok, not feeling or noticing anything. But how much is ok, for the TC.

Just curious because I was not able to find my answer else where without spending hours of research.

I assume you are driving and you are talking about TCC slip when it's engaged? if it's fully engaged, say under 20-50rpm.

Yes exactly what you mentioned. Thanks for the info.

I guess my car seems to go up to 90 RPM.