Как проверить доступность нескольких сайтов одновременно

import tkinter as tk
from tkinter import ttk
import requests
import time
from tkinter import *
from tkinter import messagebox
 
 
 
 
window = Tk()
window.geometry('400x700')
window.title("SiteChecker")
 
 
def SiteCheck():
    res=int(tim1.get())
    Site_Value = txt1.get()
    Get_Response = requests.get(Site_Value)
    time.sleep(res)
    if Get_Response.status_code != 200:
        #as I understand it, you need to make a "for" loop, but I don't understand how to implement
 
 
def clicked():
    txt = Entry(window, width=18)
    txt.grid(column=0, pady=8)
    txt_row = txt.grid_info()['row']
 
    tim = Entry(window, width=3)
    tim.grid(row=txt_row, column=1, pady=8)
 
 
 
 
 
 
lbl1 = Label(window, text="Enter references:")
lbl1.grid(column=0, row=1)
lbl2 = Label(window, text="Enter the test time: ")
lbl2.grid(column=1, row=1)
lbl3 = Label(window, text="Availability status ")
lbl3.grid(column=2, row=1)
 
 
txt1 = Entry(window,width=18)
txt1.grid(column=0, row=2, pady=8)
txt2 = Entry(window,width=18)
txt2.grid(column=0, row=3,pady=8)
txt3 = Entry(window,width=18)
txt3.grid(column=0, row=4,pady=8)
txt4 = Entry(window,width=18)
txt4.grid(column=0, row=5,pady=8)
txt5 = Entry(window,width=18)
txt5.grid(column=0, row=6,pady=8)
 
 
tim1 = Entry(window,width=3)
tim1.grid(column=1, row=2, pady=8)
tim2 = Entry(window,width=3)
tim2.grid(column=1, row=3, pady=8)
tim3 = Entry(window,width=3)
tim3.grid(column=1, row=4, pady=8)
tim4 = Entry(window,width=3)
tim4.grid(column=1, row=5, pady=8)
tim5 = Entry(window,width=3)
tim5.grid(column=1, row=6, pady=8)
 
result1 = Label(window,text="status")
result1.grid(column=2, row=2, pady=8)
result2 = Label(window,text="status")
result2.grid(column=2, row=3, pady=8)
result3 = Label(window,text="status")
result3.grid(column=2, row=4, pady=8)
result4 = Label(window,text="status")
result4.grid(column=2, row=5, pady=8)
result5 = Label(window,text="status")
result5.grid(column=2, row=6, pady=8)
 
 
btn = Button(window, text="Add another site", command=clicked)
btn.grid(column=1, row = 0)
 
Check_Button = Button(
    window,
    command = SiteCheck,
    text='Start checking',
)
Check_Button.grid(row=0, column=2)
 
 
 
window.mainloop()

def SiteCheck():
    urls = [txt1.get(), txt2.get(), txt3.get(), txt4.get(), txt5.get()]
    times = [int(tim1.get()), int(tim2.get()), int(tim3.get()), int(tim4.get()), int(tim5.get())]
 
    for i in range(len(urls)):
        Get_Response = requests.get(urls[i])
        time.sleep(times[i])
        if Get_Response.status_code != 200:
            # add code to display the status of the site

def SiteCheck():
    sites = {txt1.get(): int(tim1.get()),
             txt2.get(): int(tim2.get()),
             txt3.get(): int(tim3.get()),
             txt4.get(): int(tim4.get()),
             txt5.get(): int(tim5.get())}
 
    for url, res in sites.items():
        Get_Response = requests.get(url)
        time.sleep(res)
        if Get_Response.status_code != 200:
            # add code to display the status of the site