@ 350Z and Sam Dinakar You got his third question wrong. I think you referred to the engine idling time.
(a) In a diesel engine, some of the lights would go off and the rest would remain on. When the former lights go off, it's time to crank the engine.
(b) In a petrol engine, all lights would remain on and the there would be a faint 'whirrrrrrrrrr' of the fuel pump followed by a faint 'click'. The engine could be started after this 'click' sound is heard. Alternatively, one could wait for around 3 seconds after turning on the ignition in a petrol engine and then crank the engine to life.
Nicks - My apologies for the misinterpretation.