I rarely read or write poems past a certain length, which is probably one of the reasons sestinas give me such fits.

The main exception is narrative poetry.

One of my skills in writing is brevity. Unfortunately, that means that length is difficult! My Spanish teacher in high school used to criticize me for writing such brief works in Spanish, until she found out that I did similarly for English essays and the like.

I've toyed with the idea of a 'chain poem'. Each prompt would be for a stanza in a long poem, knitting together what would probably be a very odd story.