How long does it take to fully charge PIE? Bagel Labs August 07, 2018 08:43 Updated Follow PIE takes around 2 hours to fully charge with an average 5V DC adapter and the included micro USB charging cable. Related articles How long does the battery last? When does PIE turn off automatically? Is PIE waterproof? My measurements all show up as 0 on iOS What does the PIE app look like? Comments 0 comments Please sign in to leave a comment.