Kernel took 1 hr to build. Modules I'm not completely sure. I started at 10pm and went to bed. When I woke up and checked at 6am it was completed. I used -j10 for compiling. I haven't testing it out yet to see if everything works. Need to make a backup just in case something goes wrong.

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The kernel source which is downloaded from kernel.org or Raspberry Pi GitHub repository is in a raw state. It has not been configured in any way and no .config file exists for that reason. Until 'make menuconfig' (etc.) is run and a kernel .config file is created the source is not prepared to build or compile anything. In this case running 'make bcm2709_defconfig' would create a .config file which will compile a kernel for the Raspberry Pi 2/3 ARM device architecture. Source that has already been compiled (for example, with the sarpi*-kernel-source packages) then a kernel .config file is included as it's generally accepted and good practice that it should be. Any changes that need to be carried out can then be made in the .config file before it is used to compile the kernel source.

Another way that changes might be implemented is by applying patches or including drivers (modules) to the kernel source, where certain hardware is not already supported.

Hope this answers your query.

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WOW! Using -j10 multijobs is way more than I have ever specified. It's a general rule of thumb that number of CPUs ,$(nproc) + half that amount, combined is acceptable. So, say if you have a 4 core CPU then -j6 would be fine. I always use -j4 because I don't care at all about speed, and it's a constant that I use to test and compare over devices and build jobs. i would assert that if you used -j4 or -j6 you might find that compiling the kernel and modules runs and completes a little quicker on the Raspberry Pi 3. The size of the /swap partition is also a factor. I usually have a 2G or 4G /swap for build systems using a microSD card for storage. On my Raspberry Pi 4 [4GB] R&D test machine the /swap partition is 8G because it's running with a 500GB SSD through a sata-usb3 adapter.

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How many threads per core does the Pi3 have?

One thread per core, and four cores.

You will see from the Slackware ARM website's Beehive glimpse (build server farm) that Stuart is running (and building) kernel 5.15.4 on Slackware ARM and AArch64. So, the SARPi Project, which closely follows in the footsteps of his work, has updated its installers and system packages to kernel 5.15.x accordingly. The 'test' installers and packages running kernel 5.15.1, that where previously available in a seperate directory on the Slackware.UK repository, are no longer required and have been removed.

Incidentally, if you aren't aware of this inspired Beehive glimpse presentation which Stuart has created then I strongly advise you to bookmark the page and watch it like it's your favourite TV station.

As always, the SARPi installers and packages are available from: https://sarpi.penthux.net/index.php?p=downloads and https://slackware.uk/sarpi/

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5.15.5 compiled for me on the Rpi3

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The RPi kernel source should always build without any problems on these devices, or there'd be something wrong.

Great that you built them yourself though. Good work!

[EDIT] I'm currently testing the sarpi installer and packages before I upload them.