How do I manage my GPU hours? (If applicable) One thing students can do to manage their time is to only switch to GPU mode when they’re training the network. Lots of the steps (pre-processing, etc.) can be run and debugged in CPU mode with unlimited time before saving and switching on GPU mode to train the model. If you need additional GPU hours, please submit a request via this form and select Additional GPU Hours as the Reason for Contact under Classroom, Resources & Content.