Yes, I can take my iPhone XR in the shower several times as an iPhone XR new buy while it's waterproof ability strongest!
According to Apple Official statement iPhone XR Water Resistant iP67 Rating underwater maximum depth of 1 meters up to 30 minutes
iPhone XR water resistant have a rating of IP68 under IEC standard 60529 .
Why iPhone XR Waterproof test passed,it just water resistant?
For Apple iPhone XR Waterproof built inbreathable fabric membrane (ePTFE), simple & not durable waterproof design and easy damage! The iPhone XR Waterproof Only can be used for a short period time! so it's water resistant!
However, the iPhone XR Waterproof Testnot including steam proof Test and high temperature pressure test , steam around long times use will cause water damage, not recommend using iPhone XR in shower for too much times
Since iPhone XR IP68 water Resistant rating , as an iPhone XR new buy, it's water resistance is strongest,so it can take my iPhone XR in the shower with no problem for several times!
But for an iPhone XR not new (used for long time) and without any waterproof case, not recommend using iPhone XRin the shower!
iPhone XR IP Rating No any steam test! shower with iphone XR directly may result liquid damage!
To Avoid water damaged, recommend using an iPhone XR Waterproof Case or an iPhone XR shower phone holder prevent water damage and save expensive repair cost!
According to Apple Official iPhone Water Resistant statement:
Splash, water, and dust resistance are not permanent conditions and resistance might decrease as a result of normal wear. Liquid damage is not covered under warranty, but you might have rights under consumer law.
Exposing your iPhone to pressurized water or high velocity water, such as when showering
Using your iPhone in a sauna or steam room
The iPhone Water Resistance will decrease as our normal use.
APPLE will out of warranty when liquid damage
The iPhone XR Water Resistance Rating is IP68
IP68 Rating Standard Test not including steam proof
There is no method to know how much the water resistance left to determin if it could be used in shower next time!
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From the App iPhone Statement we know , all of the iPhone design with same Water Resistant standard, so the same answer for the new iPhone could be used in a short period time, but not recommend used for so long as water resistance will decrease without any waterproof case!