Depends, how much solder did you eat?

In all seriousness, very little. I would personally want more than just a bathroom fan to do fume evacuation. Outside on a patio/balcony is my usual spot. I also have a 120mm computer fan that I hacked onto a gooseneck mount so I can blow the fumes away from my face.

The times I can't be outside, usually due to weather, I use a table right in front of an open window, and one of those dual fan window fans set to exhaust mode, and that sucks the fumes outside effectively.

I'd call that a reasonably good setup, and, as a bonus, the fumes don't hit me directly in the face, which soldering fumes have a tendency to do.