Question

what is the call of hour​

Answer 1

Being on call means an employee is available to work if their employer contacts them. An employee who is on-call isn't working, but they are available in case they need to. Employees who are on call may need to remain at or near their workplace.

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Answer 2

Of the hour" is an expression used to indicate "of the present (short) period": Man of the hour. Need of the hour.