The Laws of Prayer (The morning services) (64)

1. Ideally one should not even interrupt between the blessing of “Ga’al Yisrael” and the Amidah by stopping and being quiet if one delays more than “kedei dibbur” (the amount of time I takes to say “Shalom alecha Rebbi).

2. In the evening sevice as well, when we interrupt between the blessing of “Ga’al Yisrael” and the Amidah by saying the blessing of “Hashkiveinu” and Kaddish (and outside Eretz Yisrael with “Baruch Hashem le’olom”), nevertheless one should not interrupt for anything else. (ibid)