Board Thread:Questions and Answers/@comment-5885468-20121219195535/@comment-1757231-20140808023542

LegendaryZX wrote: Oh... Thank you I did not know they didn't work in Singleplayer. Thanks for the clarifications! No problemo.

It does work in SSP, but only if the world is OPEN. So, you could go AFK if you really, really wanted those chunks to keep on doing their stuff.