How long does cigarette smoke last in a room?

I smoke now and then but no one knows. I had one in my room and held it way out the window and got rid of it outside. The window is still open and I have a fan on circling the room. The room doesn’t smell much like smoke but will it all be clear by 6Am in 7 hours time if I keep the window open abit and the fan on... show more I smoke now and then but no one knows. I had one in my room and held it way out the window and got rid of it outside. The window is still open and I have a fan on circling the room. The room doesn’t smell much like smoke but will it all be clear by 6Am in 7 hours time if I keep the window open abit and the fan on all night. This is the first time I’ve done this
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