What should be the size of /var for Whonix on KVM?

Right now the size of /var (on Debian 12 bookworm) here is 22G:
Filesystem Size Used Avail Use% Mounted
/dev/mapper/debian–vg-var 22G 21G 534M 98% /var
( command ~$ LC_ALL=C df -hP | column -t )
Do I need to enlarge /var and how much?

/var/lib/libvirt/images# du -h Whonix-.qcow2
8.1G Whonix-Gateway.qcow2
12G Whonix-Workstation.qcow2
/var/lib/libvirt/images# du -h --apparent-size Whonix-
101G Whonix-Gateway.qcow2
101G Whonix-Workstation.qcow2
Does Whonix-*.qcow2 needs 101G or 202G? Or less?

There also seems to be a bug in baobab (disk-usage-analyzer GUI) on Debian, it doesn’t see any .qcow files.

Required knowledge:

(Whonix is based on Kicksecure.)

Note: I am not a maintainer of Whonix KVM.