On Wed, 13 Sep 2017 19:35:36 +0100, "Richard J."
wrote:

Jarle Hammen Knudsen wrote on 13 Sep 2017 at 19:02 ...
On Wed, 13 Sep 2017 12:54:33 +0100, Neil Williams
wrote:

On 2017-09-13 11:16:14 +0000, Jarle Hammen Knudsen said:

To me, making a bus journey means getting on the bus, riding the bus
and getting off again.

TfL does not share your interpretation.

If you touch in on the second bus within one hour of touching in on the
first bus, you are not charged and the journey can be completed in
whatever amount of time it takes.

Is this documented somewhere?

It's not in the TfL Conditions of Carriage (12 Sep 2016). Section 6.8.6 says "If you make a journey using pay as you go on a bus or tram, you can make a second bus or tram journey for free within one hour of first touching in." As has been noted already, that is ambiguous.

I don't find it ambiguous at all. To me, it's perfectly clear that it
means your second touch-in will be free if it's within 60 minutes of
the first.