# Development Keys and Demonstration Keys

Refer to the following table for the difference between development and demonstration keys:

| Expiration Period | Session Limit | Can Renew/Extend Licenses?
--- | --- | --- | ---
Development Keys | 13 months | 5 hours (restart the application for another 5 hours) | Yes. Contact your Cognex sales representative or Cognex Customer Support
Demonstration Keys | 122 days | None | No