Hi Muthu,
As per the Workflows' Conflict Mitigation Matrix, Restarting the Workflow and Jumping to specific activities are possible solutions.
In the past, just like you, I used the available Workflow Commons' tools to fix Incompatible Workflows but in my case, it was quite fast.
Please note that there's a maximum number of workflow instances that can be processed simultaneously. This can be configured in the App Settings > Workflow. Is it possible that the Workflow you saw taking 30 mins was in fact just in queue waiting to be processed?