It is difficult although not impossible to obtain an extension of time in which to commence proceedings in the Fair Work Commission for unfair or general protections cases which involve a dismissal. Here is a very brief summary of the starting point for the analysis of whether an application which is lodged out of time might begin to qualify for an extension of time.
“Reason for the delay
When making a determination regarding reason for delay, the length of the delay has little to do with the determination of exceptional circumstances. Regarding this, Deputy President Gostencnik in C Ozsoy v Monstamac Industries Pty Ltd  FWC 479 stated at :
“Whilst I accept that the application lodged by the Applicant was late by only one day, that is not to the point. The length of the delay says nothing or very little about whether there are exceptional circumstances.”
A Full Bench in Stogiannidis v Victorian Frozen Foods Distributors Pty Ltd  FWCFB 901 noted at :
“The absence of any explanation for any part of the delay, will usually weigh against an applicant in such an assessment. Similarly a credible explanation for the entirety of the delay, will usually weigh in the applicant’s favour, though, as we mention later, it is a question of degree and insight. However the ultimate conclusion as to the existence of exceptional circumstances will turn on a consideration of all of the relevant matters and the assignment of appropriate weight to each.” (Emphasis added)
Necessarily, the period of the delay with which the explanation is concerned is in the period commencing immediately after the time for lodging an application had expired and ending on the day on which the application was ultimately lodged. However, the circumstances from the date the dismissal took effect must be considered in assessing whether the explanation proffered for the delay is an acceptable or credible explanation. “
Dong v Goldenlight Plaster Pty Ltd (2020) FWC 4800 delivered 8 September 2020 per Cross DP