If you're relying on the underground those data aren't important. How long maybe, but the journey time between stops on the tube is minimal and after riding it

If you're relying on the underground those data aren't important. How long maybe, but the journey time between stops on the tube is minimal and after riding it once you'll just assume its 30 seconds - 2 minutes. There is a huge disconnect between underground users and walkers, I walk everywhere in London, as do most locals, mercifully the tourists and out-of-towners take the tube, unless you're going > 6/7 stops it'll take about the same amount of time.