Rate limit for lists/members/create_all


Hello, I’m new here and to twitter development.
My apologies if this is a silly question, but this is confusing me and I don’t want to violate twitter’s policy (I have already got into troubles exceeding rate limits, which I resolved with the support) and don’t want this happening again.
What exactly is the rate limit for lists/members/create_all? I assume that it’s the default 15, but does it matter how many members I add on each request?
What I mean is that, if the limit is 15 requests per 15 minutes, do requests with, say, 3 user_id-s count towards the limit the same as requests with 80 user_id-s each?