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$h_e = T(3)C_e(2)$

_{Singular hen:}

$h= {E_1\over 1.5(12H)}$

_{Total between 4 hens:}

$Total_i = {24\over C_h(4)}$

_{Individual threshold:}

$6$

_{Time for individual completion:}

$6=3_d({I_t\over C_e[2]})$

_Answer:

$9\space days$