Sure - Vue render time forecast can trick you a lot ...

I allways like an estimation of render time for my scenes - just to see, how long my PC has to render in full speed with my 4 cores, just to see, if it still makes sense, to wait for the result or just do something else away from the computer ...

For example  - i want to render a 2000x1250 image, then i first render a really small sized image, with the exact ratio - like here a 320x200 image.
This small image most of times gets rendered really fast.

Then i multiply the rendertime by 36  (about 6x320 for y-size and 6x200 for x-size)  - it gives me a pretty good estimation for the highres render.

Most of times it's pretty close to the really needed time - many times Vue is even faster than my calculated estimation ...