通つう常じょうなら

expression

usually; normally; under normal circumstances

Sets up a contrast between what normally happens and a specific exception or hypothetical situation. Often followed by 〜が, 〜けど, or 〜のに.

• 通つう常じょうなら10分ぷんで着つくが、今日きょうは渋じゅう滞たいで30分ぷんかかった。

  Normally it takes 10 minutes, but today it took 30 minutes because of traffic.

• 通つう常じょうならありえないミスだ。

  It's a mistake that would normally be unthinkable.