This question is a follow-up to:
Can you move on your turn, and then use the Ready Action to move again on another creature's turn?
The answer to that question is yes. Acting according to the following sequence should then enable a rogue (of at least second level) to triple their maximum movement in one round, right?
- Bonus Action: Cunning Action -> Dash
- Movement: move twice your speed
- Action: ready additional movement
- Reaction: move your speed
To clarify: The idea was not to move as far as possible on your own turn (which can be more easily achieved by simply taking Dash as a Bonus Action and as an Action, as was pointed out to me in the answers), but to spread your movement over several turns by using the reaction.