If I smoke weed in a bathroom and open the window afterwards how long until the smell is gone?

The smell of weed can linger for varying amounts of time depending on factors like ventilation, the amount smoked, and the materials in the bathroom. Generally, if you open a window and have good airflow, the odor may dissipate within 30 minutes to a couple of hours. However, in less ventilated spaces or with heavy use, it could take longer for the smell to completely fade. Using air fresheners or odor absorbers can help speed up the process.