Comparison of the timescale of the fastest-growing mode in the standard vs generalized case, at t≃ 40 ms after merger. Top: Standard MRI case. All coloured points are unstable to the MRI, and we observe the τ_MRI is a fraction of a millisecond at almost all radii ≲30 km, thus making the instability sufficiently fast to impact the post-merger dynamics. Bottom: Updated case. We mask the points where the instability condition is not met. Where the generalized instability is active, we observe that τ_eMRI is close to or slightly larger than 1ms, particularly at large radii, r ≳ 15km. This means that the instability takes longer to develop according to the generalized criterion, and might be too slow to significantly impact the post-merger dynamics.