code: def episode_duration(self):
      return time.time() - self.episode_started_at
  
file_path: SerpentAI/serpent/environment.py
imports: import time
  import collections
  from serpent.input_controller import KeyboardEvent, KeyboardEvents
  from serpent.input_controller import MouseEvent, MouseEvents
  from serpent.config import config
  from serpent.analytics_client import AnalyticsClient
label_desc: Use image node_id 2 for calling the Environment obj's underlying member method code with example usage: obj.episode_duration() and returns: unknown