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If using the small regular brick then about 4 hours.

If using an iPad brick then around 3 hours 30 mins.

If using the “pro” brick with USB C then around 2 hours 45 mins to 3 hours.

Source: https://www.inviolabs.com/blogs/news/iphone-11-charging-test-which-usb-pd-charger-is-better

Added some time since they used an iPhone 11 and the 12 Pro Max has a slightly larger battery.

Thanks. So it charges (or should) at the same rate as the 11 Pro Max? Interesting that the higher cost of the 30W brick really doesn’t return much value for fast charging the Pro phones.
 
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If using the small regular brick then about 4 hours.

If using an iPad brick then around 3 hours 30 mins.

If using the “pro” brick with USB C then around 2 hours 45 mins to 3 hours.

Source: https://www.inviolabs.com/blogs/news/iphone-11-charging-test-which-usb-pd-charger-is-better

Added some time since they used an iPhone 11 and the 12 Pro Max has a slightly larger battery.
Larger battery increase expected charging time but you forget that these numbers are with 18W. So for those who will buy the 20W (or bigger) power brick this would slightly reduce charging time. The best is to wait for a more precise test.
 
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