Less than 1 month –
Less than 10 hrs/week –
Voice 50+ slides in a 1 business hour presentation. Approximately 8,000 words.
1 x male and 1 x female voice, probably UK or Australian/NZ without the twang.
Could be US, but not obviously so and not see-through disguised.
Not ponderous and powerful, but definitely strong, professional and acceptable to a global business audience.