I used the passageway from T5B to T5A last week for the first time. Really nice compared to the crowded train. ^
When I went down the escalators, the sign said 2 min until next transit. When I took the elevator up, first people from the same train just got on, so walking fast takes train time plus 2 min. People from my flight looked a little surprised seing me already in the elevator when it came up