Remembering pg's great advice before demo day, a pitch has only 2 goals:

- Capture the investors' attention -- they'll have to remember your company among dozens

- Make them curious to hear more -- you want them to reach out and ask for a meeting

None of these requires a big number of slides, or for that matter, time to go through the pitch. Most entrepreneur do a simple mistake and try to put everything that's relevant to their project in the pitch.