An Irrational Number is a real number that cannot be written as a simple fraction.
1 The nicotine will totally be gone within 1-3 days after your last using tobacco.  In urine: The urine test normally can detect nicotine level within 3-4 days after the last time you use tobacco. However, if you often smoke or you are passive smokers, nicotine can stay for a period of 15 to 20 days in urine.
How long will it take nicotene from cigarettes to get out of your system? Variable: Depends what you mean by out of system. Nicotine can clear within 2 days but its metabolic product from the liver-- cotinine --is cleared more slowly. Cotinine is often tested for in urine & blood tests and it can be found many days later, especially in heavy smokers.