Originally Posted by
Nobodyetal
I'd categorize it in TIME rather than distance. More than 45 minutes each way and it's just too much time out of the already-short day.
YMMV
I also do this, but if it is going to take me longer than my threshold time to get to work by another means (or if it is shorter but much more inconvenient / uncomfortable) then I will go over my threshold. I can probably get to most places in South / Central London by bicycle quicker than I can by car / public transport.