By "long-term" is meant ones that would take months to do. Someone might decide to read as many first contact novels as possible, or all the sf published in a given year, or all the Hugo-winning short stories, or the complete novels of Dickens, or everything by Clifford D. Simak, or as many travel books about Japan as possible, or all the weird stories mentioned in Lovecraft's Supernatural Horror in Literature (our old Chrons friend J. D. Worthington was working on that), or all the books you can remember reading before your 14th birthday... or what else?
So I wondered if anyone had such ambitions for reading. The only qualification I have in mind is that it's a definite concept of some sort that involves reading and that you estimate it would take many weeks for you to do it.