Timeout function with onTrackingBehavior extension

Hello. I'm trying to create a timeout screen in the main scene that drops you back into a static (non-vuforia) page after a certain amount of time. Right now I have it set to a certain time after the main scene is loaded. I need to be able to extend this time based on if the user is currently scanning targets. I tried pulling in the trackable behavior as an event that would start the clock from the last time that changed. However, I'm a scripting newb and am not doing so hot. I can't seem to get the OnTrackableStateChanged to run appropriately Any help is appreciated.

Code (CSharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5. using UnityEngine.SceneManagement;
6. using Vuforia;
7.  
8. public class sceneManagement : MonoBehaviour
9. {
10.     public float timeToIdle = 50.0f; //2 seconds
11.     float currentTime = 0f;
12.     float eventTime;
13.     public bool idle = true;
14.  
15.  
16.     void Start()
17.     {
18.         currentTime = Time.time + timeToIdle;
19.         mTrackableBehaviour = GetComponent<TrackableBehaviour>();
20.     }
21.  
22.     public void OnTrackableStateChanged(
23.     TrackableBehaviour.Status previousStatus,
24.     TrackableBehaviour.Status newStatus)
25.     {
26.         if (newStatus == TrackableBehaviour.Status.DETECTED ||
27.         newStatus == TrackableBehaviour.Status.TRACKED ||
28.         newStatus == TrackableBehaviour.Status.EXTENDED_TRACKED)
29.         {
30.             currentTime = Time.time + timeToIdle;
31.         }
32.  
33.      }
34.  
35.    
36.     void Update()
37.     {
38.         if (!idle)
39.         {
40.             checkIdle();
41.         }
42.  
43.  
44.     }
45.     void checkIdle()
46.     {
47.          if (Time.time > currentTime || Time.time - eventTime > currentTime)
48.          {
49.             idle = true;
50.              Debug.Log("idling");
51.              SceneManager.LoadScene("loading", LoadSceneMode.Single);
52.      
53.          }
54.      
55.     }
56.  
57.     public void loadMain()
58.     {
59.         SceneManager.LoadScene("main", LoadSceneMode.Single);
60.  
61.     }
62.  
63. }
64.