What is the test for granting an extension of time on an application for leave of absence?

Similarly in Chin v. Canada (Minister of Employment and Immigration), [1993] F.C.J. No. 1033 Reed J. stated at paragraphs 8 and 9: On what grounds then do I grant an extension of time. I have already indicated that, in general, I am not receptive to requests which are based solely on the work load counsel has undertaken. When an application for an extension of time comes before me, I look for some reason for the delay which is beyond the control of counsel or the applicant, for example, illness or some other unexpected or unanticipated event. There was no such unanticipated cause for the delay in the present case. At the time the leave application was filed, it was known that the time limit for the filing of the application was thirty days, counsel knew her client lived in Campbell River and that she would be attending the Bar Convention towards the end of August. The scheduling was under her personal control. Thus, it was hard for me to justify, in such circumstances, the granting of an extension of time.