Option 1 (when I am late) 15 miles each way ,all road with lots of traffic.
Option 2 17 miles each way ,all road , very low traffic.
Option 3 20 miles each way ,includes 4 miles of single track and forest road , next to no traffic.
I mix and match them depending what I am doing at night ,but I don’t think I would like to live much further away.
I try to do 3 days a week in the Winter and 5 days a week the rest.
It’s the only way I could ever fit my training round family life and it gives me enough base mileage to not have to worry too much about weekend top ups.