It really explains in detail: how long alcohol stays in your system, how it is detected in various tests — blood, breath, urine or hair, and what can affect these indicators (genetics, gender, liver health, etc.). If you are interested in delving deeper — here is the article:
https://unitedrecoveryproject.com/rehab-blog/how-long-does-alcohol-stay-in-your-system/ . The article from United Recovery Project puts everything in simple terms — there is even a graph to understand the time frame and what really affects detox.