When I went to the office in 2019 I could do it in as little as 15 minutes depending on timing it right, no delays and platform of arrival!!!
7 minute walk to train, 7 minute train journey and 1 minute walk from platform to office.
Now that journey takes me 10 minute walk to train, 8,9,10,11 minute train journey (who knows what it will be!) and another 10 minute walk to office (they moved).
However I now WFH so commute is zero.