There are a total of 22 dashes in the game. Most of them are speedruns under a minute long and can be done quite quickly. Invariably, the red runner vision route is not the quickest way you can take to complete these and get 3 stars. I would recommend this series of Dash videos that are straightforward and easy to follow:
https://www.youtube.com/playlist?list=PLlRXv9MVYcSyjB7JMAIPa... - the dashes start at video 78.