To be honest, probably not - taking time to see the details is not because of the time it takes to denoise, it's the time it takes to render enough passes (the regular, undenoised passes) to have enough info for the denoiser to have enough information to work with. The denoising itself is likely under 1s to process, so taking 0.3s rather than 0.5s (these are not real numbers, just ones I think are not a million miles away and illustrate the point - you can just set a final render to 2 passes and render with AI denoising to see in the render stats how long it took, e.g. in a 1920x1080 scene for me it took... 0s, it was so fast on my 980 Ti that it doesn't even register ;) ) won't make any difference.
Most likely what you would need is a faster CPU, so that the underlying passes are done faster, and the denoiser has that extra info to work with faster.