Question: How many minutes did the current goalkeeper for Borussia Dortmund remain unbeaten at his previous club?
Sentence (from "2016–17 Borussia Dortmund season"): The 2016–17 Borussia Dortmund season is the 106th season (and 107th overall year) in the football club's history and 41st consecutive and 50th overall season in the top flight of German football, the Bundesliga, having been promoted from the 2.
Relevant evidence: No