In computing any period of time prescribed or allowed by these rules, the day of the act, event or default from which the designated period of time begins to run shall not be included. The last day of the period so computed shall be included unless it is a Saturday or a legal holiday, in which event the period runs until the end of the next day that is not a Saturday or legal holiday. As used in this rule, "legal holiday" means legal holiday as defined in ORS 187.010 (which includes each Sunday) and ORS 187.020.
Or. R. Bar P. 1.9