What is the limitation period provided to a defendant for filing an application for leave to appear and defend a suit under the summary procedure (Order XXXVII of CPC)?

Under Section 113 of the CPC, a Reference can be made to the High Court during the pendency of a case when:

The purpose of ________ is to enable subordinate courts to obtain, in non-appealable cases, the opinion of the High Court on a question of law and thereby avoid the commission of an error which could not be remedied later.