Originally Posted by Bookpossum
As we haven't come to it yet this year because of the switch in February, could you please clarify what "Time Period" means?
Sure. Time Period is similar to Region. We have a list of time periods, and start the month with a vote on which time period to use before nominations start. We've done the category once before in February 2012 already so you can look at that month's nomination thread if you want to get an idea before next month.
ETA - Here is a link to the first Time Period nomination thread: http://www.mobileread.com/forums/sho...d.php?t=168076