Progress bar/countdown with hours, minutes, and seconds?

Hello everyone. I am having some trouble with my code. I am very new to coding(only 2 weeks) and am having trouble with my progress bar and countdown. Below is the script that I am currently using with comments.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class ArcaneScript : MonoBehaviour
 {
     //Script References
     public GameManagerScript GMS;
     public ArcaneMastery AM;
 
     public Text ArcaneIPC;
     public Text ArcaneLevel;
     public Text ArcaneCooldown;
     public Slider ArcaneBar;
 
     //Arcane per click
     public float Arcane = 1;
     //Base Arcane per click
     public float BaseArcane = 1;
     //Arcane Level
     public int Arcanelvl = 1;
     //Arcane Time
     public float ArcaneCD;
     //Arcane Max Time
     public float ArcaneCDMax = 1.5f;
     //Click rate cooldown condition
     public bool cooldown = false;
 
     // Start is called before the first frame update
     void Start()
     {
 
     }
 
     // Update is called once per frame
     void Update()
     {
         //minimum slider value
         ArcaneBar.minValue = 0f;
         //Maximum slider value
         ArcaneBar.maxValue = ArcaneCDMax;
         //Arcane lvl display
         ArcaneLevel.text = "Level:" + Arcanelvl;
         //Arcane Cooldown display with hours, min, and seconds
         if (ArcaneCDMax >= 60)
         {
             if (ArcaneCDMax >= 3600)
             {
                 ArcaneCooldown.text = "" + ((ArcaneCDMax - ArcaneCD) / 3600).ToString("##") + "h";
             }
             else
             {
                 ArcaneCooldown.text = "" + ((ArcaneCDMax - ArcaneCD) / 60).ToString("##") + "m";
             }
         }
         else
         {
             ArcaneCooldown.text = "" + (ArcaneCDMax - ArcaneCD).ToString("#.0") + "s";
         }
         //Arcane Influence Per Click display
         if (Arcane >= 1000)
         {
             if (Arcane >= 1000000000000)
             {
                 ArcaneIPC.text = "Influence Per Click: " + (Arcane * 0.000000000001).ToString("#.00") + "T";
             }
             else
             {
                 if (Arcane >= 1000000000)
                 {
                     ArcaneIPC.text = "Influence Per Click: " + (Arcane * 0.000000001).ToString("#.00") + "B";
                 }
                 else
                 {
                     if (Arcane >= 1000000)
                     {
                         ArcaneIPC.text = "Influence Per Click: " + (Arcane * 0.000001f).ToString("#.00") + "M";
                     }
                     else
                     {
                         ArcaneIPC.text = "Influence Per Click: " + (Arcane * 0.001f).ToString("#.00") + "K";
                     }
                 }
             }
         }
         else
         {
             ArcaneIPC.text = "Influence Per Click: " + Arcane;
         }
         //Defines what is referenced by slider.
         ArcaneBar.value = ArcaneCD;
         //starts time when cooldown is in effect
         if(cooldown == true)
         {
             ArcaneCD += Time.deltaTime;
         }
         //Used for Arcane Mastery to start auto tick
         if(AM.ArcaneMaster == true)
         {
             //Adds time
             ArcaneCD += Time.deltaTime;
         }
         //When slider is full reset to 0 and add Arcane power.
         if (ArcaneCD >= ArcaneCDMax)
         {
                 GMS.Influence += Arcane;
                 ArcaneCD = 0;
         }
     }
     //Parameters for clicking Arcane button.
     public void ArcaneClick()
     {
         //Can only click when cooldown is false.
         if (cooldown == false)
         {
             //Changes cooldown to true to prevent multiple clicks.
             cooldown = true;
             //Invokes cooldown reset.
             Invoke("ResetCooldown", ArcaneCDMax + .01f);
         }
     }
     //changes cooldown back to false so the button can be clicked again.
     public void ResetCooldown()
     {
         cooldown = false;
         ArcaneCD = 0;
     }
 }

I realize that most of my code is irrelevant to the question, but I put it in there in case there is something causing a bug. Right now my slider and countdown timer work and it will display either hours, minutes, or seconds with correct information. I cannot figure out how to display all 3 when the number is in the hours. I have tried a few different techniques but nothing seems to work. Thank you very much in advance for the help.