We are going to present to a Seattle VC tomorrow morning. I've done that quite a few times.
The interesting dynamic of presenting your business plan to a VC (or any professional investor) is that for you is a big deal, for them, is just another Startup.
For the Startup, it takes days if not weeks preparing for the presentation. Documentation, financial projections, balance sheet, slides, support docs, etc.
For them, you are probably the 18th Startup asking for money this month, out of which half were completely stupid ideas, and at least one of them resambles your business. Though.