SEO Delhi Company (e-fuzion) discusses it by taking suitable examples, MSN, will accept a Meta keyword Tag up to different characters long, while hotbot indicates small number of characters.
However, some top-ranking pages of Hotbot�s in various categories used Meta key word Tags which much larger than 75 characters.
So SEO Delhi (e-fuzion) using large numbers characters which can be used as guideline.
The key words and key phrases usage in header Tags is very powerful in SEO.
As headlines makes a page easier to read and helps in rapidly finding required information, it saves time.