I smoked meth for first time it was 1/2 a gram how long will it stay in urine?

Four days. The time it takes for 1/2 the circulating drug to exit the body is up to a day, and it takes 4 of those reductions by half each day to become undetectable in a urine study. In a slow metabolizer it may linger longer.

The better question to ask is the potential damage meth can do to a 44 yo male, as severe and even life-threatening outcomes can be encountered. This is a drug of intense risk (as can be laced with fentanyl) and any abuse is NOT safe. Seek out counseling and avoid future use. We can also address this with a virtual consult here at HT (www.connect@healthtap.com)

Hopefully this will be the only time you smoke Meth. It is dangerous. Please consider why you chose to do this. Is it because of a new person influencing you? This is a terrible addiction that can ruin your life. Whatever your new issues are you can seek help from a Clinical Psychologist with expertise in multiple types of psychotherapy.