Yep, when I talk about AVERAGE runtime then what I mean is .....

I take the total number of threads running and suspend internet until all have completed. Today that is 40 wus so I will end up adding together all 40 times then dividing by 40 for the average time it takes a single thread to complete.(today that is 35 mins and about 13.5 seconds). However during the time it takes a single thread to complete I have completed 39 other threads too so I take the average single thread time and divide by 40 for the AVERAGE time between completed wu's. (52.83 secs for my last 40 today) with no adjustment for about 24 hours.

Is this the best way? I don't really know but it does give me something to work with when I look at daily production:

24*60*60 = 86400 seconds a day which I divide by that AVERAGE to complete a wu time of say 52.83 secs is around 1635 wu's a day so I keep an eye on this ..... It is not helped by the problem of varying PV numbers but overall I see what I need to doing this. Using this method works best for me if I run new settings for a week.

I am sure that I have explained things better than this before now but I hope you get the gist