"What is literature for the purposes of this club? A superior work of lasting merit that enriches the mind. Often it is important, challenging, critically acclaimed. It may be from ancient times to today; it may be from anywhere in the world; it may be obscure or famous, short or long; it may be a story, a novel, a play, a poem, an essay or another written form. If you are unsure if a work would be considered literature, just ask!"
It's always worth asking. In the end nominators and voters are given the task of determining the suitability to the category. In both books clubs there seems to be hits and misses for categories so I wouldn't worry too much about it.
As we've deduced that the waiting period is waived in the literary club, I would like to put forth:
Birthday Letters by Ted Hughes again.
I read it in 2012 and would like a re-read as well as some discussion.