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? Where can I download the PIE app? Can I have multiple members or users on a single account? What is the fastening gear? When do I use it? When does PIE turn off automatically? Comments 0 comments Please sign in to leave a comment.