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

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

• The iPhone 13 Pro Max measures about 6.33 inches (160.8 mm) in height

• The iPhone 14 Pro Max is similar in size but exact height details are not provided in the current results.
• The upcoming iPhone 16 Pro Max is expected to have a screen size of 6.9 inches diagonally, but the exact height is not specified here

So, generally, the iPhone Pro Max models are around 6.3 inches (about 160 mm) tall.