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Answer:
should at least last 8-9 mins maximum
Step-by-step explanation:
the audience might not understand if it is shorter than 7 mins
the audience might get bored if it is very long
A good presentation must at least be 7-10 minutes long and probably not exceed a certain point where the presentation get's boring.
For example in a school project, it shouldn't exceed 15 minutes because there are other students needing to present. In a business proposal however, can be 30 minutes long or more just to stick with the subject and good points.