Maximum time on Automatic lock?

[hal1]

Under Settings > security and screen lock > automatic lock, it gives options from 5 to 10 minutes, and 'maximum'. - this is the time the screen actually after going to sleep. Does anyone know what 'maximum' is?

 

[lovecars]

Do you have the latest update to 4.4.4? Maximum is actually about 60 minutes. but on the 4.4.4 update Maximum is no longer there.