{C : Type u₁} →
  {inst : CategoryTheory.Category.{v₁, u₁} C} →
    {D : Type u₂} →
      {inst_1 : CategoryTheory.Category.{v₂, u₂} D} →
        {F : CategoryTheory.Functor C D} → {G : CategoryTheory.Functor D C} → [SizeOf C] → [SizeOf D] → (F ⊣ G) → ℕ