That so depends on the presentation and content. Typically, for engineering presentations, I assume 1-3 minutes per slide with average of 2 minutes per slide, for a 20-30 slide presentation. If you have only 5 or 10 minutes, about 5 to 10 slides.
There are 1200/60 = 20 minutes
There are 10512000 minutes in 20 years.
20 hours is 1,200 minutes.
20 years = 10,513,333 minutes.
0.333 degrees in 20 minutes.
There are 20 minutes in a 1/3 of an hour
80 minutes
500 minutes.
20 minutes is 1,200,000 milliseconds.
20 kiloseconds = 20,000/60 minutes = 333 minutes 20 seconds = 5 hours 33 minutes 20 seconds
20 minutes.