What is the page limit for an open access review paper in IEEE or Elsevier?
IEEE say on their FAQ-page:


  There is no page limit for articles 


It is more complicated for Elsevier, as different journals have different page limitations, you simply have to check the journals' webpages.

Having said that, a paper of 80 pages seems to be rather long - in my field this would certainly result in an immediate rejection, unless you explicitly classify it as a review paper - and that seems to be what you should do. In my field, however, you are not simply writing a review paper, but are usually asked to do so and then it is clear/obvious (even expected) that the paper will be long.

So, if you were asked to write a review paper, everything should be fine, write as many pages as you want. If you have decided on your own to write a review paper, check if you can classify it as a review paper during submission process - if not, tell the editor that this is a review paper (the referees have to know this).