How To Fulfill Eating Jewish Festival Second Meal

You must eat a second meal on Jewish festival (or Shabbat) day with 1.9 fl. oz., or 56 ml, of bread--even if you already said ha'motzi and ate bread at kiddush.
Note There is no essential time limit for eating the second meal, but it must be before you get distracted (hesech da'at). Otherwise, you must hear kiddush again and drink wine (or grape juice) or eat bread/mezonot before eating anything.