The ideal length of heading tags (h1 & h2)

Selected answers from the Dumb SEO Questions Facebook & G+ community.

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  Claire Kanika: What should be the length of heading tags(h1 & h2). Can we use two sentences in h2 tag?
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  Janaki Raman: i suggest you to go h1 tag is your major keyword of your landing page.. and you must must use h2 in one sentence and its your secondary keyword
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  Praveen Kumar: Hi Clair there is no length in Using H1 tags and H2 tags. It just tells the search engines to use the preferred keywords in your web page. ;
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  Claire Kanika: +Praveen Kumar ;ok, thanks, so can i use two sentences in my h2 tags? & one more thing i have to ask, can my h1 tag(heading of the blog) & my title tag be same?
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  Praveen Kumar: You can make some variations in Title tag and H1 tags use primary keywords in title tag and rest of the keywords you can use in H1 tags it depends on your priority
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  Claire Kanika: +Praveen Kumar ;Ok, thanks
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  Praveen Kumar: Wellcome