creation of ext4 filesystem takes 20+ hours???

[Marco Fioretti]

Greetings,
yesterday morning I put Ubuntu 22.04.1 LTS on a USB key, and installed it on the computer I'm using right now. Everything went smoothly.
Then I took a T430 thinkpad with two SSDs inside, let's call them A and C 
A, 320 GB, on /dev/sda, previously hosting both windows and ubuntu 20.04
C, 64 GB, on /dev/sdc
(/dev/sdb would be the USB key)

I wanted to use all of A as /home, so before starting the install I deleted its windows partition, and expanded the ubuntu one to fill the whole drive. Then I started the installation, and told the installer to:
1) place boot loader and ubuntu on the C drive
2) reformat /dev/sda, make an ext4 filesystem on it and make it /home
the installer said "OK, no problem, but this may take a long time" 

20 hours later, it's still doing it, the little circle that replaces the cursor slowly spinning...
Is this normal? Did I do something wrong, and damaged the drive? ? Should I still wait, or do what, shut down and restart?
Thanks,
Marco
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