guix pull; guix package -u; sudo guix system reconfigure /etc/config.scm

[Gottfried]

As I understood I should do a "guix pull" every week.

But what is with "guix package -u"
When I did it two days ago it took 6 hours. I couldn't swich off my 
laptop. So I can do it only when having a lot of time.
Normally it took approx. 30 min
If I don't need always the latest version, I can do it once a month or 
once in two month
Is that okay?

Do I have to do a "sudo guix system reconfigure /etc/config.scm" always 
after the "guix package -u"?
Can I do it every month or every second month? when I don't need the 
latest version of packages?

Gottfried