(e)The returnable date to be specified in the documents shall be so fixed as to allow sufficient time for execution and return of the documents to India before the date fixed for the next hearing of the suit. In no case shall the returnable date be fixed at less than 3 months after the date on which the documents are finally despatched to the High Court. In the case of Iran the period shall ordinarily be not less than six months and in case of Thailand not less than eight months.