You should always plan rehearsal time into your timeline so that you have enough time to run through your entire presentation with your visual aids and without.
There's no set number of times you need to rehearse, but the more you do, the more smoothly your presentation will go. A good rule of thumb is to rehearse enough so that your talk is second nature.
Here are some tips for planning your rehearsal time:
- Find someone to listen and give you feedback.
- Rehearse your timing and write down how long each section takes you.
- Practice at least once with your visual aids so you know when you'll use them and what you'll say.
- Prepare for the Q&A by thinking about the questions you might be asked and then rehearsing brief, clear answers.