"seat time" meaning in English

{
  "etymology_text": "Due to the fact that students mostly are sitting at desks during educational courses.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "seat time (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Education",
          "orig": "en:Education",
          "parents": [
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The amount of time a student has spent attending a particular course."
      ],
      "id": "en-seat_time-en-noun-41LgmVK3",
      "links": [
        [
          "education",
          "education"
        ],
        [
          "course",
          "course#English"
        ]
      ],
      "raw_glosses": [
        "(education) The amount of time a student has spent attending a particular course."
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "education"
      ]
    }
  ],
  "word": "seat time"
}

{
  "etymology_text": "Due to the fact that students mostly are sitting at desks during educational courses.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "seat time (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Education"
      ],
      "glosses": [
        "The amount of time a student has spent attending a particular course."
      ],
      "links": [
        [
          "education",
          "education"
        ],
        [
          "course",
          "course#English"
        ]
      ],
      "raw_glosses": [
        "(education) The amount of time a student has spent attending a particular course."
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "education"
      ]
    }
  ],
  "word": "seat time"
}