Can I change the “Auto Sleep” time?

Yes, auto sleep can be configured in the Acaia Coffee app settings, which you can download for iOS or Android here: https://acaia.co/pages/acaiacoffee

First, pair your device to the scale in the app's "Remote Scale" option, then go to the settings by tapping the gear icon in the upper right corner. In the settings menu, tap the "Auto Off Setting" highlighted in the picture below, and select the time you'd like your scale to automatically power off. 

The default Sleep time is 5 minutes.