"long since" meaning in English

{
  "head_templates": [
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      "args": {
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      "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"
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          "source": "w"
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            "Terms by semantic function"
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        {
          "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"
        },
        {
          "ref": "2012, David Walliams [pseudonym; David Edward Williams], Ratburger, London: HarperCollins Children’s Books, →ISBN:",
          "text": "Reluctantly Raj used his fingernail to prise away the bogie he had long since sneezed up there and popped it in his mouth.",
          "type": "quote"
        }
      ],
      "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",
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  ],
  "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 idioms",
        "English lemmas",
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        "English terms with usage examples",
        "English uncomparable adverbs",
        "Pages with 1 entry",
        "Pages with entries",
        "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"
        },
        {
          "ref": "2012, David Walliams [pseudonym; David Edward Williams], Ratburger, London: HarperCollins Children’s Books, →ISBN:",
          "text": "Reluctantly Raj used his fingernail to prise away the bogie he had long since sneezed up there and popped it in his mouth.",
          "type": "quote"
        }
      ],
      "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": [
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      "audio": "En-au-long since.ogg",
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  "synonyms": [
    {
      "word": "of old"
    },
    {
      "word": "way back"
    },
    {
      "word": "long ago"
    }
  ],
  "word": "long since"
}