Nx = 1286e0.0124t
nY = 1573e-0.186t

When Ny = 2Nx:
1573e-0.186t = 2 X 1286e0.0124t
ln 11573 - 0.186t = ln 2 + ln 1286 + 0.0124t
t = 2.48 days

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