A Gong Fu tea timer in the form of a Python script.

tea-timer.py

"""
tea-timer.py is meant for timing tea steepings,
and is made specifically for gong fu style brewing.

It also includes a delay timer before starting the
steeping timer to allow time for picking up the kettle
or other things like that.
"""

import time
import os
from win10toast import ToastNotifier

toaster = ToastNotifier()

base = int(input('Base Time (s): '))
add = int(input('Add Time (s): '))
delay = int(input('Delay (s): '))
priorsteeps = input('Any Prior Steepings?: ')
current_steep = 0 if priorsteeps == '' else int(priorsteeps)
cust_add = -1

last_time = 0

def calcTime():
    if cust_add != -1:
        return last_time + cust_add
    else: 
        return base + (add * current_steep)

while True:
    for i in range(int(delay), 0, -1): # delay timer
        print(i)
        time.sleep(1)

    print("Starting timer...")
    nseconds = calcTime()
    last_time = nseconds
    if (nseconds % 5 != 0):
        print(nseconds)

    for i in range(nseconds, 0, -1): # steep timer
        if i % 5 == 0 or i < 5:
            print(i)

        time.sleep(1)
    
    current_steep += 1
    toaster.show_toast("tea-timer.py - Steeping Done", # send windows notification
                       "Total Steepings - {}\nNext Steep Duration - {}".format(str(current_steep), str(nseconds + add)),
                       duration=8,
                       threaded=True)
    print("TIMER DONE ({}s) - Total Steepings: ".format(last_time) + str(current_steep))

    custadd = input('Press enter to start next steeping ({} s)\nOr, enter a number to set additional steep time.> '.format(str(nseconds + add)))
    if (custadd != ''): 
        cust_add = int(custadd)

    os.system('cls')