The show will resume production February 28 for four more episodes.
February 17, 2011
Two and a Half Men has been on production hiatus during the month of February due to star Charlie Sheen's recent personal issues. Reports are now saying that the show will resume production on February 28, and will film four more episodes. This would lower the show's eighth season total to 20 rather than the original order of 24.
(Source: TV by the Numbers)