Updated: Yesterday evening the three network evening newscasts offered a second half-hour to affiliates, making the programs one-hour long.

With the news of Osama Bin Laden’s death still somewhat fresh, NBC says that “NBC Nightly News” will once again be making a second half-hour available to affiliates tonight.

Last night the program had close to 80% of affiliates take the one-hour version.

“CBS Evening News”will return to its regular 30 minute format this evening.

ABC News is planning a regular, 30 minute edition of “World News”