You might be inhaling too hard, avoid puffing away on it.
Or you might be smoking a cheap cigar (~ under $20).
A loose, general guideline is: draw no more than once a minute for a smooth "burn".
It also depends on your ring guage (thickness or circumference of the cigar). A "typical" cigar should last an hour or more then.
You should visit your local cigar shop and chat up the owner. Just be polite and they'll love to introduce you to the finer points of cigar smoking.
What are you smoking anyways?
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