curl --request PUT \
  --url https://api.everhour.com/tasks/{task_id}/estimate \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <api-key>' \
  --data '
{
  "total": 7200,
  "type": "overall",
  "users": {
    "1304": 3600,
    "1543": 3600
  }
}
'

{
  "id": "ev:9876543210",
  "name": "Task Name",
  "projects": [
    "ev:1234567890"
  ],
  "section": 1234,
  "labels": [
    "high",
    "bug"
  ],
  "position": 1,
  "description": "<string>",
  "dueAt": "2018-03-05 16:00:00",
  "status": "open",
  "time": {
    "total": 7200,
    "users": {
      "1304": 3600,
      "1543": 3600
    }
  },
  "estimate": {
    "total": 7200,
    "type": "overall",
    "users": {
      "1304": 3600,
      "1543": 3600
    }
  },
  "attributes": {
    "Client": "Everhour",
    "Priority": "high"
  },
  "metrics": {
    "efforts": 42,
    "expenses": 199
  },
  "unbillable": true
}