Trending @Cognizant; If escalation is from client side then what action our team take around how much time they will handle it.

Depends on the criticality of the issue and escalation. If you already have a solution, plan it out , discuss and then create a time motion study for yourself and give a circa +1 day of time basis your requirements, first do a trial run and then once you are confident then intimate the client of the plan and derived results