Hello Saideshwar,
SPDD can't be an automatic process, because you have to choose if mantain or loose your custom modifications. To save time you can include your work in a CR and import that CR in the systems of the same landscape automatically. Follow carefully SAP docs to understand how to do this.
One more thing: SPDD is not a routine task. You have to do it only when the system asks you explicitly, during patching or upgrade.
Best Regards,
Valerio