Can a person who has been investing for more than decade earn 15lakhs per year from dividends only?

If you have enough invested in good dividends giving stocks then yes you will earn 15 lakhs per year. Not just 15 you will earn even 50 lakhs per year but you will need so much invested for it.

Short answer yes. how do you think warren buffet earns

Let’s say you have 3 corore to invest. If you invest it in banks with 10% dividend annually, you might achieve that. Example, GBIME is at 190 which means 3 corore will give you about 150k+ shares. Assuming 10% return (looks possible looking at previous year returns), you will make your required amount.

You can do even better with promoter shares but I am not too familiar with those and still learning so cannot give much detail.

What amount. Make it clear buddy. 5 years is enough, just pick some multibaggers

anything is possible if you have shit load of money

So my friend father invested in nabil back in the day and have huge quantity of it now 20 40% cash dividend every year

Depends on how much you have invested

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If someone had invested the money in company like UNL and reinvested the dividend in the same company then its definitely possible.

Depends on the money you Invest