Unable to delete a process

I was able to decommission a deployed process with the version #17. When i am trying to delete the process, studio hangs for few seconds and then comes to normal state but process is not getting deleted.

From automation studio logs, I see an error “Error while calling Action for Entity Process. Status code=422, Description=Unprocessable Entiry”.
From Control tower logs, i see a timeout error

Is there a possibility to increase the timeout from 15000ms to higher number?