Recently moved house, placing me 4 miles south of where I used to live, in the opposite direction of work. It’s added 10 minutes at non-peak time and anywhere between 20-40 minutes at peak time if traffic is particularly bad. This means in total my 15 mile journey is 40 minutes at best, generally about 50 minutes and at worst 1hr 10 minutes.
However, I am hybrid so I only have to do this commute 2 days a week.
How far would be too far for you?