Alchemical Item Question- Pressure Pills

[Aviel]

No where does it say how long the pressure pill lasts. It says it takes one full round to adjust to the pressure. But for 75gp does it really just last as long as you are underwater?

http://www.archivesofnethys.com/EquipmentMiscDisplay.aspx?ItemName=Pressure %20pill

[Shiroi]

I can't find it on d20pfsrd, archives doesn't list a duration, I think I'd call it instant, which seems to be in agreement with the flavor text. It's basically something you do at each level of pressure you pass to allow you to survive that pressure, if you can teleport and akip a few layers it'll save you some pills. You'll also want to use them on the way up, decompression is a nasty visual.

I don't see any RAW to prove this, it's just a gut feeling about the RAI from that flavor text.