There's no technical limitation to the length of heading
tags (H1, H2 etc) as they're not displayed anywhere other than on the content
page. (Unlike the meta-title attribute, for example, that gets truncated on the
Search Results page if it's too long.)
But My Rule of thumb is , the H1 heading should
describe the paragraph / content below it (in not more than one sentence). For
the next headings you could use the H2 tag.
RJR Hospital -
Siddha Treatment for Psoriasis in Chennai |
Rheumatoid Arthritis Treatment in Bangalore |
Arthritis Treatment in Vellore |
RJR Hospital