What is the Maximum length of time, in hours, that a company should take to respond to an email ? ( write the correct answer in Numeric form)

12 hrs is the maximum number of hours a company should respond to an email. 

24 hours

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between 12 to 24 hours ...............................

The question does not describe the email pertaining to which department. In general within a day in order to gather relevant authentic information. If the email is connected to customer and it's his/her concern, then with in 30ms to acknowledge and intimate about the time to take to respond with resolution. Thn within a day to go back with resolution.

Thanks for invitation

12-24 hours

Companies should take no longer than 48 hours to respond to an email or they risk losing a potential client/customer.

Thanks for the invite ............................ 24 hours

A practice should be inculcated to respond as early as possible

As a  norm, it should be within "24hours" or one day