There are a lot of discussions about correcting Chainline, but I can't find any discussing what is an acceptable deviation. on a single speed, Fixed gear or internally geared Hub bike obviously

If its close to straight, (say a few mm out) is it worth the trouble of respacing and re-dishing a wheel just to get those last couple of mm in line?

How much mis-alignment or deviation in Chain line is acceptable?

I searched and couldnt' find an obvious thread.