Similarly on the Nexus fingerprint scanners. There's a 48 hr timeout. All the reasons it will require a secondary method[1]: • When your fingerprint isn't rec

Similarly on the Nexus fingerprint scanners. There's a 48 hr timeout. All the reasons it will require a secondary method[1]: • When your fingerprint isn't recognized after a few tries • After restarting your device • After switching to a different user on the device • After more than 48 hours have passed since you last unlocked using your backup method [1] https://support.google.com/nexus/answer/6285273?hl=en https://support.google.com/nexus/answer/6285273?hl=en