50% in 20 Minutes on the iPhone Duo
The iPhone Duo gets to 50% in around 20 minutes, but only with a 60W USB-C adapter, and Apple lists it as available separately. If you already have a pro laptop charger, you just plug it in and you're good to go. With a 35W adapter on the MagSafe Charger it's about 30 minutes. 60 watt is gonna be your friend.
Apple's numbers: https://www.apple.com/iphone-duo/specs/
Download SayRay on the App Store: https://rfer.me/sayray