Sof Davar, there is no bitul z’man in learning the skills necessary to make it in this world. When the Beis Hamikdash is rebuilt and we have to bring trumos and maasros again, if for no other reason, math will be valuable to enable us to properly calculate what we owe. We are not on the madreiga of Bnei Yisroel in ancient times, so we really DO need to learn those skills. You want to know what is REALLY bitul z’man (AND money)? Taking time to purchase and light up a cigarette, as so many Beis Medrash boys do.
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