You need not more than 10 minutes to make the card.
1. Make an Origami Heart
Paper size: 7 cm x 7 cm.
Paper color: Red
2.Make the Whole Valentine Card
White cardboard or paper size 13 cm x 9.5 cm
Red paper size 6 cm x 8.5 cm
White paper size 5 cm x 7.5 cm
Glue or silicone
One origami heart from the tutorial above
That's all from me guys. I wish you happy Valentine's Day!