About render times and Denoiser

Hello! I've got some questions about the Denoiser from Hitfilm, it works really well, but it rocket shots the render times to exterior space when I try to render something with it.

Let's suppose I have a one minute video, I render that video with chroma key, other effects, etc..., no problem, final time of render for that minute video, 1:30 minutes or so.

If I were to apply a denoiser render time would to up to around one hour. Is there anyway to optimize the Denoiser? I know about lowering the frames of the sample,  but still, how can I optimize it?