bar lengths

is there any rough guides to length (or width, depending on which way look at it) to bar lengths? ive just bought a new bontrager carbon bar and its about 40 cm shorter than original FSA one, which i did find a bit wide/long, but had wondered if that was because it was a 'proper mountain' bike, and it was suppose to be like that? any advice welcome?
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Hope this helps.
Cheers,
Scott
Whyte 46, i fall off it alot!!