Touya and Minori and the rest of the players in the training camp are hitting a wall with the way they fight.  And Minori's suggestion is that they introduce themselves to one another!
That means I can cast it 
once every twenty seconds,
Zusammen wären das 20 Sekunden.
Si puedo dispararlo una vez cada 20 segundos,
Avec ses 20 secondes en tout,
Significa che posso lanciarla 
una volta ogni venti secondi,
Se eu disparar a cada vinte segundos,
Дайте мне двадцать секунд —