Hey @Bose_28 
The timeout length depends on if your running workflows with the code-executor. If you are, there is a 15 minute limit. We're working on removing this limit for code-executor configurations in the near future for self-hosted customers as well as updating our docs to eliminate this confusion.
I'll be sure to add in your ticket as a "+1" to this request.
Let us know if you any have additional questions!