Time exclusion for obtaining certified copies permits exclusion of delay in applying for High Court certified copy after leave refusal. Calculation of the period of limitation for filing a Special Leave Petition excludes time taken to obtain a High Court certified copy if the application for that certified copy is made after refusal of leave to appeal, because a certified copy is not essential to file the SLP under the Supreme Court rules; Standing Counsels should apply afresh for the certified copy after refusal even where one was obtained earlier.