Here's the thing. Reading 90 books of poetry in a couple of months would be ridiculous. I'm assuming, though, that reading is usually rereading, and that the point is to have a mix of books--some I've lived with for many years, others I might have looked at once or twice, and a few that I am reading "cold," for the first time. If someone were beginning a similar project without having read many complete books of poetry in the first place, it would be a completely different task.