@mister.hyde if you follow the template structure (intro - body - conclusion) - with correct oral fluency - you should be able to finish at 30-35. I agree with @czianczia28 - 20 seconds is very short to cover everything.
tip lang - minsan di na din pasok to include a third value.. so most of the time just take high and low value sa bar graph or pie chart.
paraphrase the information in the title or pag talagang di kaya, just read it.
important na you mention the categories in the graph (at least mention 2).