Water damaged iphone help needed?

I got my iphone 5c last week and i just spilled water on the corner of it so you can see like the water trapped in the corner of the phone under the screen. It still works though but you can see the water bubble. I just put it in rice but how long should i leave it in there for? Will 3 hours be enough? And if the phone works now with water inside it, does that mean it will continue to work or could it just pack up at any time?

Added (1). I just realised that there was no water buble, it was just my background haha so now everything works and i can't see any water, does that mean it is okay?

This is a difficult one to sort because the water is trapped between two wafers of plastic and can't evaporate easily try placing it in an airtight box with a damp absorber enclosed. Wilkinson or
Poundland sell these.

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