"long since" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "long since (not comparable)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English positive polarity items",
          "parents": [
            "Positive polarity items",
            "Terms by semantic function"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Past",
          "orig": "en:Past",
          "parents": [
            "Time",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "I don't know why he asked me to do that, when I had long since finished it.",
          "type": "example"
        },
        {
          "text": "The building has long since been demolished.",
          "type": "example"
        }
      ],
      "glosses": [
        "Long ago; in the (distant) past."
      ],
      "id": "en-long_since-en-adv-MpDbBiLW",
      "links": [
        [
          "Long ago",
          "long ago"
        ],
        [
          "past",
          "past"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) Long ago; in the (distant) past."
      ],
      "related": [
        {
          "word": "lang syne"
        }
      ],
      "synonyms": [
        {
          "word": "of old"
        },
        {
          "word": "way back"
        },
        {
          "word": "long ago"
        }
      ],
      "tags": [
        "idiomatic",
        "not-comparable"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-long since.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/5/52/En-au-long_since.ogg/En-au-long_since.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/5/52/En-au-long_since.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "long since"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "long since (not comparable)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "related": [
    {
      "word": "lang syne"
    }
  ],
  "senses": [
    {
      "categories": [
        "English adverbs",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English positive polarity items",
        "English terms with audio links",
        "English terms with non-redundant non-automated sortkeys",
        "English terms with usage examples",
        "English uncomparable adverbs",
        "en:Past"
      ],
      "examples": [
        {
          "text": "I don't know why he asked me to do that, when I had long since finished it.",
          "type": "example"
        },
        {
          "text": "The building has long since been demolished.",
          "type": "example"
        }
      ],
      "glosses": [
        "Long ago; in the (distant) past."
      ],
      "links": [
        [
          "Long ago",
          "long ago"
        ],
        [
          "past",
          "past"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) Long ago; in the (distant) past."
      ],
      "tags": [
        "idiomatic",
        "not-comparable"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-long since.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/5/52/En-au-long_since.ogg/En-au-long_since.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/5/52/En-au-long_since.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "synonyms": [
    {
      "word": "of old"
    },
    {
      "word": "way back"
    },
    {
      "word": "long ago"
    }
  ],
  "word": "long since"
}