Illustrated Presentations

I am down do present a talk to my local history group. I have done presentations in the past but they had not been designed to fit into a specific time frame. The time allocated for talks is 45 minutes. I have read that the average adult can say approximately 183 words a minute. By my calculations, that works out at roughly 8000 words over 45 minutes.

Does anyone have any experience to know if that makes sense. Any help or advice would be appreciated