The description of Bottled Breath from Princes of the Apocalypse says:
This bottle contains a breath of elemental air. When you inhale it, you either exhale it or hold it.
If you exhale the breath, you gain the effect of the gust of wind spell. If you hold the breath, you don’t need to breathe for 1 hour, though you can end this benefit early (for example, to speak). Ending it early doesn’t give you the benefit of exhaling the breath.
What is the action economy cost of using this item? Action? Object interaction? Is it different for "exhale it" and "hold it"?