vayasyair balakais tatra
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
When the teachers went home to attend to their household affairs, the students of the same age as Prahlada Maharaja would call him to take the opportunity of leisure hours for play.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
In tiffin hours, the hours when the teachers were absent from the classroom, the students called Prahlada Maharaja, wanting to play with him. As will be seen from the following verses, however, Prahlada Maharaja was not very much interested in playing. Instead, he wanted to utilize every moment for advancing in Krsna consciousness. Therefore, as indicated in this verse by the word krta-ksanaih, at the opportune moment when it was possible to preach about Krsna consciousness, Prahlada Maharaja used the time as follows.