Here is an article about all fifteen short film nominees, including live action and documentary. The three categories run about 90 minutes each and typically show separately, in the case of Houston the documentaries show at a different theater.

http://www.nytimes.com/2016/01/29/movies/oscar-nominated-shorts-mirroring-a-world-of-pain-and-fortitude.html?action=click&pgtype=Homepage&version=Moth-Visible&moduleDetail=inside-nyt-region-0&module=inside-nyt-region&region=inside-nyt-region&WT.nav=inside-nyt-region&_r=0