I am currently running Asteroids@Home, Einstein@Home, and Universe@Home on a Nokia C100/N152DL, two cores (it has 4 total, but as we know, BOINC works better running on just half of the cores at a time). Due to fiddling around with one of the settings, I currently have:
* Asteroids: 6 WUs, deadline November 10 11:45 UTC, expected runtimes ~22-23 hours
* Universe: 20 WUs, deadline November 13 23:44 UTC, expected runtimes ~12-15 Hours
* Einstein: 16 WUs November 11 0:43 UTC, expected runtimes ~15-16 hours.

It is currently running 2 A@H tasks concurrently, and has been for a couple of days. I would expect, given that it would finish the Asteroids tasks before the deadline even using just one core (I have BOINC running nearly 24/7) that it would also try to switch in tasks from one of the other projects. I know that some of them are going to likely time out anyway, but why not try to get in as many as possible? This is version 7.24.1.

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BOINC (for Android) 8.0.0