What is the approximate cost of Enterprise edition License key. and how long does the validity for the same stays?
Hey @Avin,
it all depends on your project and usecase. If you like to find out more you can drop us a note here: Camunda Platform Enterprise Edition - Camunda . Someone with more knowledge on our pricing models than me 
will reach out and discuss the details for your project.
I hope that helps
Kind regards
Nele