I don't even know how many unique images I have online, because different agencies have different stuff (different rejection policy and some take editorial or RM) but there is a lot of overlap, too. So my total is maybe 40% more than my largest individual portfolio.
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Yes, I guess with large portfolios it is impossible to really know. As you mentioned, if you know the site which accepts most of your submissions normally accept 80% of all, then you can add 20% to your portfolio on that site as a guess.
Just wondered about it, as there is a lot of posts mentioning peoples portfolios and was not sure how to compare to mine. Guess best is to ask in the specific post what the person is referring to, as this seems to be open to personal interpretation.