There is a time limit for filing a judicial review. You have 60 days from the date the decision was made to file a judicial review of a decision made by the RTB. This 60-day time limit applies even if you received the decision on a date after it was made, for example if it took a few days for the decision to get to you in the mail.
If you do not file within the time limit, you may lose your right to bring a judicial review. It is possible to apply for an extension of time, but there is no guarantee that the court will give one and it complicates the judicial review process if you file late.
Also, if you are going to apply for a stay of your eviction until your judicial review is heard, if possible, you should apply far enough in advance of the effective date of the order of possession so that you can give your landlord notice of the proceedings in the Supreme Court and time to respond to them. See more details about the timeline for applying for a stay.