There is an obligation to eat matza three separate times at the seder; motzi matza,korech (Hillel’s sandwich), and for the afikomen.
The amount a person needs to eat is as follows:
Motzi Matza and Afikomen – 1/3 of a hand-made and 1/2 of a machine matza.
Korech – 1/4 of a hand-made and 1/3 of a machine matza.
One must recline when eating the matza and should try to eat each portion of matza within two minutes and at most four minutes.