Source: Critical Role

Wondrous item, ??? (requires attunement)

While you wear these boots, you can use a Bonus Action and click the boots' heels together. If you do, you benefit from the effects of the Haste spell for the duration of this effect. If you click your heels together again, you end the effect.

When the boots' property has been used for a total of 10 minutes, the magic ceases to function until you finish a Long Rest.