After considering whether we should populate that field (it's easy to do), we decided that it makes little sense at PrimeGrid, given that we have tasks like SGS and tasks like SoB and DYFL. The "average" turnaround time would be a useless statistic.
I've removed that line from the host display page.
Please do not PM me with support questions. Ask on the forums instead. Thank you!
My lucky number is 75898524288+1