Expeditious Retreat

I don't know how use this spell yet

이 주문 어따 써야할지 모르겠음 아직도

The key to this spell is that you can use Dash as a bonus action instead of using your action for that, so it is available for other options. In the turn when you cast the spell, as it is cast in the bonus action, you can also dash. 

So since the turn you cast the spell, that turn included, and for 10 minutes (assuming your concentration is not broken) you can dash as a bonus action instead of using your action. 

The wording is not entirely clear. Can you dash again once as a bonus action sometime during the 10 minute duration or every bonus action during the 10 minute duration?

Huge difference in value of spell. The 2014 spell was clearly the latter but the wording has now changed,

Thanks

“Until the spell ends”

Since it doesn’t end when you Dash, it is still in effect for every turn for 10 minutes: 101 Dashes max.

Does this allow you to take the Dash action as an action and as a bonus action in the same round? I don't think it does but the wording makes me unsure 🤔