Acceptable noise levels?

[Jadefox]

Hi Guys

What according to you is an acceptable level of noise before you stop a render.
I've noticed for my renders to go from 1% to 0.9 noise,  could easily take an hour depending on complexity of scene with very little difference in overall quality.
It seems I waste a lot of unnecessary time for a couple %'s that's not really adding to overall quality.
Where do you guys on average stop your render?

Thanks in advance

[Fluss]

I'm still in early tests but 2% with a slight bit of denoising looks fine to me.

[William Yan]

yes, I usually have a denoiser of 0.7 when noise level is under 2%.

[steyin]

We usually get away with 10%, though I'll go down to 5% for presentations (with denoising set to .6). Anything less is really unnoticeable to me.

[cecofuli]

<2% is very low in my opinion =) 
3% is good with a little bit of denoise.
If you print it, 4% is enough.