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my commute is 15 miles each way, and it took me a couple of weeks to a month for the body to get used to it, try not to do it five days a week, but now after 2 odd years, I can pretty much do it in my sleep, not crushing it, or using it as training, but just pushing out the miles.
the commute itself is fine, it's more the starting and returning times that are the ballache, don't get to do much of an evening, because I get home relatively late.
I'd say give it three days a week, and see how you feel, then if the weather's good, do more days, if not, dial it back.
Also don't beat yourself up if you don't do it, and/or buy a brompton if you're on the train so you can still do some cycling whilst still being able to jump on public transport if necessary...
How far is too far for a daily commute?
That is the question. Added to the physical nature of the work, I'm thinking a 27mile each way slog may be relegated to occasional fun.