Touch ID had the same 4 hour rule. Note that the 4 hours time limit only comes into play if it's been 6.5 days since you last used your passcode. The full rule

Touch ID had the same 4 hour rule. Note that the 4 hours time limit only comes into play if it's been 6.5 days since you last used your passcode. The full rule ensures that you need your passcode approximately once a week, and the 4 hour thing basically just means you won't be surprised with a passcode request 5 minutes after you successfully unlocked it with your face.