Clandestine cloak VS greater clandestine cloak duration

[Ravingdork]

Clandestine Cloak You pull the cloak’s hood up and gain the benefits of nondetection for 1 hour or until you pull the hood back down, whichever comes first.

Greater Clandestine Cloak The item bonus is +2, and when you activate the cloak, you gain the benefits of 5th-level nondetection for 8 hours.

Does the nondetection effect of the greater clandestine cloak last for 8 hours, or for 8 hours or until you pill the hood back down, whichever comes first?