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I would guess 3 colour channels at 16bit (i.e. 2 bytes)

(2^32)÷(1920×1080×4×3×2) = 86

Where does the 4 come from? I thought it was R+G+B+A, but you already have 3 colour channels in that calculation

Yep, my logic is faulty there. And even if we assume that it's 24bpp color, that's still a factor of 2 out.