Overnight I got 8 HST units. I suspended everything else and started all 8 of them and re-enabled everything else. All 8 threads are occupied with HST. They are running on a 2600K with 8gb of memory on Linux Mint. They all indicated 19 hours and 11 minutes of runtime. after the first ten minutes of runtime, they all appear to be running normally. I will let everyone know how the progress is going.
Cheers

The results are in. All eight of the HST units finished with no problems. The cpu times were from 22:43 to 22:55 hours. This is a little bit longer than the initial estimates of 19 hours when they started. I sympathize with Aurum420, but don't think the problem is malformed HST units. If that were the case, others surely would have gotten some and would have noticed the outlandish projected run times. I think I would look at a possible hardware issue, specifically a bottleneck issue with the hardware. One way to check this would be to suspend all but one of the HST units and see if the condition persisted. Another way would be to limit the number of HST units running at one time to one and gradually increase that number until the condition recurred. I am speculating that some resource was being maxed out and this caused the computer to be churning without really getting any significant work being accomplished, even though the cpus were running at 100%. Good luck.
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Praytell why ?
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I'm still getting an HST WU every few days. They've been taking 8 to 9 hours of CPU time, around 13-14 hours elapsed time. There's one in my queue now with estimated time 15:19:08. I've seen nothing unusual so far, but will report if something strange happens.

I was running 32 concurrent HST WUs on one machine and had 256 running across ALL machines. All completed normally with no exceptions. Currently have sporadic HST WUs running across the farm and these are completing normally also