I just started crunching here again after a long delay (summer too hot to crunch) and I have really long completion time for the equivalent of a gtx1080TI
I looked at the app page and it shows the following requirement

These are not being cooled properly and you are cooking your GPU's. I'm pretty sure they are thermal throttling to protect themselves. They shouldn't be running over 75C. Nominally 60-65C would be better.

I don't know if these have blower or fan type coolers but you definitely need to turn up the fan speed with a more aggressive fan curve and get them cooled down.

It looks like you actually have three of them so depending on what case they are in that could be problematic if there isn't enough airflow.

If they happen to be server grade cards with a bare heatsink and no fans, these must have significant air flow to be cooled properly. They are designed to be used in servers that are made for them.

All my systems are Windows based so I'm not an expert on setting up fan curves and monitoring properly on Linux. If you need help with that, one of the Linux gurus will need to pipe up and give you some recommendations.

I put a large fan on the system. It is an open rack, and the temps dropped to a reasonable value as shown. It looks like the Time Left is dropping 4 days for every hour of Elapsed Time. I am guessing a completion time of 30 hours. Hopefully the WUs will all be valid.

The estimated completion time won’t be correct until you complete a bunch of tasks, I think the limit is 10 or 11 tasks to get a baseline. This is because the app is new and your system doesn’t know it’s performance yet.

30hrs for a P102-100 sounds about right
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Those temps are definitely better. It looks like you have the fan blowing on your D1 card but not as much on the others. If you could even it out more and get the other two cards under 70C that would be ideal.

Open rack systems systems create a whole different challenge for cooling. Do the best you can to keep the cool air going to the GPU's and CPU. Make sure the hot air isn't recirculating directly back into the system.

My GTX 1080 Ti's can complete the tasks in about 30hrs. If yours are cooling enough to run at the max boost clock they should be close to that.

As Ian&Steve mentioned, if there is enough work to keep your cards busy, the timeline should look more reasonable soon.

My GTX 1080 Ti's can complete the tasks in about 30hrs.

My GTX 1080 Ti's can complete the tasks in about 30hrs.

This is too much. My GTX 1080 Ti completed one under 21h 15m.

The P102-100 only has PCIe 3.0 x4 available anyway (it’s a mining card), which is JUST enough to keep it from slowdown on GPUGRID, slowdowns can be expected if it’s run at PCIe 2.0 and/or on fewer lanes (USB risers only carry a single lane)