I would like to know what are the projects whose tasks take less time to execute, for a computer that I use little, 1 hour a day.
I would also like to know if only one task can be done at a time, so that it can be done before.
Thank you.

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The answer depends on your computer hardware and operating system. For example a SETI@Home task will take less than minute a Linux system with a RTX2080 GPU while the same task will take over 8 hours on an old mobile phone.

I would like to know what are the projects whose tasks take less time to execute, for a computer that I use little, 1 hour a day.
I would also like to know if only one task can be done at a time, so that it can be done before.
Thank you.

There are many task types with World Community Grid that will take less than an hour on a fast computer.

You can use the computing preferences to restrict how many tasks you are sent at once. Options>Computing preferences.[/quote]

It is a 5 icore with 6 gigabytes of ram.

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Which is about as useful an answer as saying "I've got a car with 4 wheels". An Intel i5 comes in many flavours, with all different speeds.

At Rosetta@Home you can set the amount of time a task can take, with a minimum of 1 hour. http://boinc.bakerlab.org/rosetta/
But do know, something that's to be held into account for all projects, it takes time for BOINC to guess correctly how much time a task takes on your computer. The estimated time that the project puts on its tasks is just that, an estimated time on a basic computer. Yours may be faster, slower, in between, and so even for a project where you can set the task length to be an hour, it doesn't mean your computer will do the calculations within that hour.

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The computer I use most has an Intel Core (TM) i5-4440 CPU @ 3.10GHz, 3101 MHz, 4 main processors, 4 logical processors and 16 gigabytes of RAM and Rosetta takes 10 hours on 4 simultaneous tasks without any interruption

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Go to Rosetta Project Preferences and adjust the wanted run time to 1 hour.
But as I said, it doesn't have to mean that the first couple of tasks do run for just one hour.

Don't you have a GPU in that system? Or do you use the built in Intel HD Graphics 4600? These don't have OpenCL support, so cannot be used. But if the system has an open PCIe slot and you're willing to spend a little on a cheap GPU, your output can increase enormously while, if you then choose the project right, your GPU can rip through multiple tasks in one hour.

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