This means "about the distance that someone can throw a stone." AT: "a short distance" or with an estimated measurement like "about 30 meters" (UDB). (See: [[rc://en/ta/man/translate/figs-idiom]])
Jesus is referring to the suffering that he is about to endure as if it were in a cup and that he was going to drink it. AT: "take away from me this cup of suffering" or "take away this suffering from me" or "rescue me from having to suffer like this." (See: [[rc://en/ta/man/translate/figs-metaphor]])