Hey Alexey!

 AV> No - only approx. 4 hours on RPi 4B with 4 Gb RAM :-)

That sounds about right.  Best of luck compiling a modern firefox on there.  :::shudder:::

 AV> I update kernels either after some serious security fixes being
 AV> upstreamed or after a month (or two) had passed since previous
 AV> build, whichever comes first.

 AV> That's ok for production use and even for the distribution assembly.

I'd go along with that as it more or less fits my observations over the past couple decades.  Also, by past observation, I am thinking around 5.18.x before this latest development branch starts delivering on a few noncritical but always nice to have features such as boot penguins.  :-)

Life is good,
Maurice

... ša ne sacaš še ‘tsamne ne beoš.
    They do not quarrel who are not together.
--- GNU bash, version 5.1.16(1)-release (x86_64-moosile-linux-gnu)