code: def get_execution_time(self) -> float:
      return time.time() - self._start_time
  
imports: import base64
  import json
  import os
  import time
  from typing import Any, List, TypedDict, Union
  import uuid
  import requests
  from collections import defaultdict
label_desc: Use image node_id 12 for calling the QueryExecTracker obj's underlying member method code with example usage: obj.get_execution_time() and returns: unknown