Question: Our shul davens Mincha
on Shabbos about an hour before Shabbos ends. By the time I get home, it is
after shekia. Is that too late to start eating seuda shelishis?
Answer: The Shulchan Aruch (OC 299:1) writes
that one shouldn’t start eating when it gets dark on Shabbos afternoon until havdala.
If one had started eating a meal before this
time, one can continue eating (See Aruch Hashulchan OC 299:3).
The Mishna Berura (299:1) writes that while it is preferable
to eat before shekia, if one hasn’t yet eaten seuda shelishis, then one should
eat up to half an hour before tzeis hakochavim. Among other reasons, he
explains (Shaar Hatziyun 299:2) that we are not accustomed to be so strict
about shekia, especially when there’s a mitzva to eat seuda shelishis.
R’ Moshe Sternbuch (Teshuvos Vehanhagos 2:203) writes that
while the Chazon Ish was particular not to eat after shekia,
nonetheless, most poskim allow one to begin eating seuda shelishis a few minutes
after shekia (See Shemiras Shabbos Kehilchasa 56:4; Rivevos Ephraim 1:264).
In conclusion, it is preferable to begin eating seuda shelishis before shekia,
though it is justifiable to begin a few minutes afterwards if necessary.