How to timeout herd's network services start for not to stop boot process ?

[znavko]

Hello, Guix developers! I'm so happy that OS Guix works on a new PC, cause I've 
tried to buy 2 laptops where wifi or even graphics did not work!
On Dell Vostro 3670, Core i5 9400, Nvidia Geforce 710 Guix works and even wifi 
works (but I use usb wifi adapter for better connection power).

I have inconvenience: during boot guix stops and wait for about 30 seconds on 
wifi connection, as on images and dmesg:

http://0x0.st/ialz.jpg
http://0x0.st/ial-.jpg

# dmesg |grep wlp
[ 2.715775] ath9k 0000:05:00.0 wlp5s0: renamed from wlan0
[ 3.383086] ath9k_htc 1-1:1.0 wlp0s20f0u1: renamed from wlan0
[ 174.055212] wlp0s20f0u1: authenticate with xx:pp:xx:pp:xx:pp
[ 174.313915] wlp0s20f0u1: send auth to xx:pp:xx:pp:xx:pp (try 1/3)
[ 174.315645] wlp0s20f0u1: authenticated
[ 174.318674] wlp0s20f0u1: associate with xx:pp:xx:pp:xx:pp (try 1/3)
[ 174.323907] wlp0s20f0u1: RX AssocResp from xx:pp:xx:pp:xx:pp (capab=0xc11 
status=0 aid=3)
[ 174.332535] wlp0s20f0u1: associated
[ 174.528137] IPv6: ADDRCONF(NETDEV_CHANGE): wlp0s20f0u1: link becomes ready

I did not tried with internal wifi, but usb wifi adapter starts for soo long!

I've attached my config where I have to comment wpa_supplicant service and 
dhclient for resist this delay during boot. And I connect manually.

Please, can you say me how to postpone herd services networking, 
wpa-supplicant, dhclient and start them after slim's start or for example after 
5 seconds after finish of boot process?

Also can you say how to add my bash script to autorun after boot if I do not 
use cron (for my future experiments)?

znavko.

guix-config.scm
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