Why would you think that? Why I ask is the Scriptures in post # 462 and #464 all seem to indicate that they did not understand what Jesus meant when he told them he would die. Immediately after the Olivet Discourse he is betrayed and then Crucified but then in all of the Gospels they seem as though they were not expecting him to die and then return from the grave in three days.
Instead the ones who went to his tomb believed the gardener had moved his body not that he rose from the dead. Thomas when told said he would not believe it unless he saw the nail holes so he doesn't seem to be reacting as if he was expecting him to rise after three days. Peter instead of going to his tomb as if he understood he would rise on the third day was instead was going fishing. Cleopas in Luke 24:21
https://biblehub.com/interlinear/luke/24-21.htm is very outspoken in saying to Jesus that they had hoped/trusted that he(Jesus) had been(pas-tense) he who should have(Pas-tense) redeemed Israel but that it was the third day after what was done(Jesus death) and so he doesn't seem to think Jesus was the one to redeem Israel anymore.
In short though if they had understood and believed he would die and be raised the third day then it would make sense they were asking him about his "second coming" but all four Gospels show that all of them were caught off guard by him being killed and not expecting him to rise the third day from the grave so in Matthew 24:3 they would have only been able to ask of the only coming they understood and believed.