Oracle 23c

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ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS';
CREATE TABLE my_table (id) AS
SELECT LEVEL FROM DUAL CONNECT BY LEVEL <= 1e6;
1000000 rows affected

DECLARE
  CURSOR c1 IS SELECT * FROM my_Table;
  my_record my_Table%ROWTYPE;
  startDate DATE := SYSDATE;
  endDate   DATE;
BEGIN
  OPEN c1;
  LOOP
    FETCH c1 INTO my_record; 
    EXIT WHEN c1%notfound;      
    --some updates
      
  END LOOP;
  --commit;
  CLOSE c1;
  endDate := SYSDATE;
  DBMS_OUTPUT.PUT_LINE((endDate - startDate) DAY TO SECOND);
END;
/
1 rows affected

dbms_output:
+000000000 00:00:08.000000000

DECLARE
  CURSOR c1 IS SELECT * FROM my_Table;
  my_record my_Table%ROWTYPE;
  startDate TIMESTAMP := SYSTIMESTAMP;
  endDate   TIMESTAMP;
BEGIN
  OPEN c1;
  LOOP
    FETCH c1 INTO my_record; 
    EXIT WHEN c1%notfound;      
    --some updates
      
  END LOOP;
  --commit;
  CLOSE c1;
  endDate := SYSTIMESTAMP;
  DBMS_OUTPUT.PUT_LINE((endDate - startDate) DAY TO SECOND);
END;
/
1 rows affected

dbms_output:
+000000000 00:00:09.133979000