Dear madhu Mittal
as per your information the decree is ex-party, if its against you then you are the judgement debter and you have 90 days time to set a side the ex-party decree under order 9 rule 13 CPC 1908 and the decree holder have right to file execution petition any time within 12 years. as you ask that the ex-party decree holder file EP before passed 90 days, there is no provision that the decree holder can not file EP before 90 days, you file an application u/o 9 r 13 in the court who passed the decree and if the Hon'ble court satisfied with your view and circumastances the decree can be set a side.
if any other clarification the feel free to write me on my mail nadeemqureshi1@gmail.com
or call me on 9953809956