What's the amount of time needed for Tramadol to leave the body? I know that Opiates take 72 hours.

This depends on several factors - obviously, first one is for how long and how big a dose of Tramadol have you been using. There is higher chance it will show up if tested for if you are a long-term, high dose user. The second major thing that is that not every test can detect Tramadol, but the ones really important ones, like for healthcare or other higher-responsibility positions or even reasons - will be able to detect it. Also, the your overall health determines if your kidneys will be able to process the drug in this 72 hour period.

For how long does cannabis stay in the blood and urine?