I'm hoping so, because there are an awful lot of them pending, but:

I'm doing my CPDN computations with surplus solar in a totally standalone office, and as a result, they take me a bit longer to get done - I suspend the machines at night, or when there's not enough sun to run them. The downside is that they take longer than the normal 10-12 days of compute to run (wall clock), and WUs are taking about a month lately (should improve as I get into sunnier seasons - I can power stuff from sunup to sundown with the new panel layout).

Is this still useful, or should I prefer other projects and leave the N216 to machines that can chew through them a bit faster, wall-clock-wise?

Tricky.
A month should be OK, but there's no way to guess what the various researchers are thinking.
I suspect that they know it'll take a while to get the lot, especially with the slower computers, so carry on.

A batch of tasks covers a wide range of starting values, all of which are needed.

Sounds like an interesting setup, do you have documentation of it anywhere?

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Sounds like an interesting setup, do you have documentation of it anywhere?

Yeah, you can find some of the details of the build here: https://www.sevarg.net/tag/solarshed/

It's my solar powered office ("Solar Shed"). I've got, currently, about 5kW of panels hung (trying to power through winter still doesn't quite work without a generator), a 48V/225Ah/10kWh lead acid battery bank, and 2kW of inverter output in the office.

I've got a couple different machines in there that run opportunistic loads - if I have enough sun, I run them, if I don't, they stay off (or asleep). There's an i7-3820 running Windows that used to run W@H when there were WUs, but mostly does WCG work and Folding@Home now (it's got a pair of older GPUs of some sort). There's a dual socket Xeon with gobs of RAM that pulls a ton of power and still pulls a ton of power asleep, so it doesn't get CPDN tasks - they don't restart well. I've got a Haswell NUC (with eDRAM) with some pretty funky bonus heatsinking on it that's a desktop box and compute node (it sleeps fine), and there's a Broadwell eDRAM based box on a shelf that also runs CPDN tasks (it suspends fine too).

These generally run during the day, and not at night, because I see no point in beating up my battery bank that badly (cycling it deeply hurts longevity). So, compute time is generally dependent on how much sun we have. But with the 5kW of panel (a new addition in the fall, up from about 2.8kW), I can run them a lot more this spring.

Depending on the time of year, a VM on the homeserver might also be chewing on CPDN. I typically turn that set of tasks on in the winter to help with heating (it's less efficient than a heat pump, but also more useful in theory), but that's in the house. And I've got a 1U box in a datacenter that runs some CPDN stuff too, only one or two threads of it because there's plenty else going on with that box. The house has about 16kW of solar on a ground mount array (also detailed on the blog, though I've not finished the posts on it yet).