OMN has revealed that the New Super Mario Bros. game for Wii took them around six hours to complete. However that figure was without collecting all the star coins, of which they'd assume to take another seven or so hours to collect as well.
<blockquote>ONM has answered a bunch of reader questions about the upcoming New Super Mario Bros. Wii game, which is being reviewed all over the place at the moment. Mike finished it yesterday and loved it.
Once question deals with that all important topic of size. "It took me around six hours to complete, but that was blitzing through it and not collecting the Star Coins. That will easily add another seven or eight hours to the proceedings, because you'll obviously have to play through most of the levels again and some of the coins are in really awkward positions this time," says ONM. </blockquote>
News Source: <a href="http://www.computerandvideogames.com/article.php?id=225997" target="_blank">CVG</a>