When the code runs a buzzer turns on indefinitely. I want the buzzer to play for x seconds what lines of code do I need to add?

import pigpio import time import sys pi = pigpio.pi() PinNumber=13 FrequencyHz=5 # first arg is pin number, # second arg is frequency in Hz, # third arg is number of ON units out of 1000000 print ("The Output Frequency is:", FrequencyHz, ) while True: pi.hardware_PWM(PinNumber, FrequencyHz, 500000)