Q345:

Bard with archetype Duettist gets familiar and at 4th level familiar can use masters bardic performance's. But with:
Each round that the familiar performs consumes 2 rounds of the duettist’s bardic performance.

Question: There is Performances that have instant effects (Wordstrike and Weird Words from Sound Striker archetypes) and mustn't be maintained all the time. Will familiar consume 2 rounds per use or it don`t counts as "Each round performance" and will cost only one round per use?