The length (height) of the iPhone Pro Max models varies slightly by generation:

• The iPhone 15 Pro Max (17th Gen) has a height of 6.29 inches (159.9 mm)

• The iPhone 14 Pro Max measures 6.33 inches (160.7 mm) in height

• The iPhone 13 Pro Max is 6.33 inches (160.8 mm) tall

So, generally, the iPhone Pro Max models are about 6.3 to 6.33 inches long. The latest iPhone 15 Pro Max is slightly shorter than the 13 and 14 Pro Max models.