I have a portable PC that I work on regularly, but also turn off; and can run WUs of 2 hours or less.
What projects have the smallest CPU run time?

People suggest looking at https://wuprop.boinc-af.org/, but I've not gone into details myself.

Most projects save their progress periodically, so you don't need to worry about it. And there is probably hibernation function in your OS, which allows you to save all running applications to disk and then shutdown.

People suggest looking at https://wuprop.boinc-af.org/, but I've not gone into details myself.

Looking at the site you’ve linked it appears to take at least 1 thread continuously to record what the other threads are doing. A bit wasteful?

People suggest looking at https://wuprop.boinc-af.org/, but I've not gone into details myself.

Looking at the site you’ve linked it appears to take at least 1 thread continuously to record what the other threads are doing. A bit wasteful?

Well, I had a bit of a poke around after posting that, and if you go to http://wuprop.boinc-af.org/results/delai.py and hover over 'afficher le menu', you can drill down and find things like runtimes for different projects running on the same hardware configuration as you have. You can look at other people's experiences without having to contribute yourself - although I think the single thread used is non-compute-intensive, so can monitor in the background without impacting on the science.

Looking at the site you’ve linked it appears to take at least 1 thread continuously to record what the other threads are doing. A bit wasteful?

It's as a non-computing-intensive application, running at very low priority, 0% CPU usage. All it does is collect data.

I'm not as much caring about the CPU utilization, as is about WU time.
I run a PC a few hours at most. I need to finish a WU in that time. (dual core 2,1Ghz).
It's free cpu time I get, and running the CPU at 100% is probably preferred.
However after I close the PC, the data gets erased, and freshly installed upon reboot.
Hence the question.

That sounds like a Cytrix (or similar) based PC, where there is no local disk only one sitting on a server which i purged with each shutdown/reboot cycle. These can be a real pain :-(
A thought - do you have your own "home" (A folder that you can always get at, useful for stuff you are working on but don't want on the corporate drive yet and doesn't get scrubbed on shutting down.) drive on that server? If so installing BOINC and its data on that might be a solution.

In THEORY it is possible to restrict Rosetta to one hour runs, but I've found that to be a somewhat optimistic setting as with it set I've been seeing 2-4 hour runs :-(
One that might be worth looking at is RALPH@Home, which is a version of Rosetta aimed at the portable PC user, but I've never tried it myself so can't make a recommendation either way.

That sounds like a Cytrix (or similar) based PC, where there is no local disk only one sitting on a server which i purged with each shutdown/reboot cycle. These can be a real pain :-(

Used Cytrix when in NHS. By the time I left it was locked down so well, I couldn't get BOINC to run at all on it without having admin rights which in theory, I didn't have.

However after I close the PC, the data gets erased, and freshly installed upon reboot.
Hence the question.

sounds like a work machine. if you don't have the access/ability to change this behavior, then you probably shouldn't be running BOINC on it. honestly it sounds too slow to get WUs done in 2hrs anyway.

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You can set target WU runtime at Rosetta@Home, who are currently crunching COVID-19 WU.