The thing about the interverse gap is that it's a part of the music, as much as the verse. So, one piece of music from the in-breath before the playover to the end of the echo after the last verse. Thus, the interverse gaps are counted/felt according to the pulse of the music, not necessarily the number of beats. (Perhaps the pulse could be defined as the minimum number of beats in the bar if one was conducting a competent orchestra. (E.g. 2 for 4/4, 1 for 3/4, etc.) )