Can I get around extremely long time to setup WIFI connection WPA2 Personal?
4 even 5 seconds is normal for connecting to WiFi. How long takes your phone or other devices to connect? 

You can connect a little faster with static IP address.

EDIT: With WiFiNINA library for Uno WiFi Rev.2, you can change the connection timeout with WiFi.setTimeout(). The default is 5 seconds. WiFi.begin() can end with WL_CONNECT_FAILED but if you later check the status of the connection it will eventually be connected. 



With esp8266 or esp32 you can make the connection persistent and it is build up immediately after boot and asynchronously. WiFiNINA library doesn't make this possible yet. Some future version will offer WiFi provisioning.