GUI for simple python project

[Qwertz]

Hi,
I am new here. I came here because I need help with GUI for my python project. I don't understand how to make GUI (using tkinter), so please can u help me?
My project is just code witch converts time in formate like 6.82 (you have to use . instead of ,) hour converts into 6 hours and 49 minutes. Can you help me with just simple GUI pls? I want to learn it.

def enterNumber():
    global FloatHours
    FloatHours = input('FloatHours = ')
    try:
        float(FloatHours)
    except ValueError:
        print('Invalid number. Try again.')
        enterNumber()

enterNumber()

hours = int(float(FloatHours))
minutes = int(((float(FloatHours) * 60) % 60))

HoursAndMinutes = f'{hours} hours and {minutes} minutes.'

print(HoursAndMinutes)

end = input('End')