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.
I mean, it depends. It's mostly dangerous to kids, because it's detrimental to brain development. Not exactly vitamins for anyone though.
Also something to remember about ingestion is that, lead only forms salts in acidic environments, and, your stomach is quite acidic, which is why it's such a problem. Combine that with lead accumulating in your body and, well, it's best to avoid it, and it's simple enough to avoid it.
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.