I disagree with #2. I use small fft's for 24 hours. I used to think that 12 hours was enough. But a couple of times, I was testing overnight and discovered next morning that the system I was testing failed at 14 and 18 hours. That system finally passed a 72 hour small fft test run.
I somewhat agree but must admit not totally. 24 hours is a long time to be honest though I'm guilty of having done around a week of that running
. I don't see a problem as 12 hours being a baseline at this time to run through the initial test phase. Should it fail later the box probably requires some further tweaking which would normally be a minor change...
my 2 cents.