podbitka 123 metry J a 80 mb podbitki - czy to mozliwe ??

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Subject: podbitka 123 metry J a 80 mb podbitki - czy to mozliwe ??
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Witam

fachury mialy kupione 123 m listwy J i z tego im wyszlo 82 metry podbitki, mi wyszlo
po bardzo zgrubnych pomiarach < 70

pytanko czy z 123 m J mozna zrobic 80 m podbitki bo jak dla mnie to 123/2=62 i po
zawodach

osobno sie liczy jakies inne elementy o ktorych nie wiem (zabudowy belek)

czy wala w ch... ?