Book Discussion: How Long Do You Take to Read a Series?

I used to be eager to finish reading a series, thus binge-reading all the books one after the other in order. But lately I have found myself reading the first book in a series, and not reading the rest of the books, not right away anyway. Some of the  reasons for this: 

1. A lack of interest in continuing (though this is pretty rare)
2. Unable to find the rest of the books in the series at the library and not wishing to buy the rest if they can't be bought second-hand
3. Finding a book other than the first one (happens often when getting thrift-store books)
4. No hurry to continue right away, especially series with really long books (e.g., The Outlander series)
5. Simply forgetting that I even began (also rare)

One thing that I have come across in my challenges in recent years are prompts for reading a duology or trilogy. In that case, I have to read all the books in the same year, though I have tended not to read the next one(s) immediately after the first one.  One prompt I have this year is "The final installment in a series." I don't yet know what book or series this will be from!

Does the above apply to you? Usually not to me, as I'm always reading something. When I'm done with a  series, I go on to read whatever I choose. Sometimes It's hard to decided what to read next, but that's true in any case (perhaps this could be another discussion topic).

How about you? How long do you take to read a book series? Do you binge or take your time?

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