Same issue on Orange Pi 5, it used to start fast then hangs for ~ 1mn after some upgrades.
systemd-analyze blame
1min 31.472s plymouth-quit-wait.service
25.068s apt-xapian-index.service
2.713s NetworkManager-wait-online.service
1.086s xrdp.service
1.074s NetworkManager.service
604ms snapd.seeded.service
538ms dev-nvme0n1p1.device
501ms snapd.service