If it does start after 5 minuts and not after one hour, to me it sounds like you are loosing feul pressure. And the reason it takes so much crack to start is because your car isnt able to built pressure fast enought. I would suspect ur fuel filter, and look for very small liq. When you turn of ur car , ur feul pump actualy turns off about 5 sec later to built or maintain fuel pressur, if ur loosing that pressur there is defenetly a small liq some were. Hope it helps . Good luck mate .