This is how I change wait time of a timer. At first it is
mobTimer.stop()
mobTimer.wait_time = 250/300
mobTimer.start()
I thought, by default rounding the vale to 1, so I tried to maintain float value by
mobTimer.stop()
mobTimer.wait_time = float(250/300)
mobTimer.start()
but unfortunately the timer wait time is always 1.