Do not calculate a deadline from a general website answer. Oklahoma's general limitations statute includes a two-year period for many noncontract injury claims after accrual, and Section 1053 states a two-year period for wrongful-death actions.
Claims within the Governmental Tort Claims Act use a separate process: Section 156 generally requires notice within one year; Section 157 addresses actual or deemed denial, including a 90-day approval period, and generally requires suit within 180 days after denial, with written-extension language in the statute.
Accrual, tolling, minority, probate, governmental status, tribal or federal law, and other facts can change the analysis. A website form does not stop any deadline, and evidence may disappear sooner.