journalctl --vacuum-time does nothing

[baba <for.ad@xxxxxxx>]

Hello,

root@debian:/# journalctl --list-boots
-7 23e0ab37a4774932a2574ca383925641 Sun 2022-05-08 10:47:07 CEST—Sun 2022-05-08 11:05:24 CEST
-6 60441d099e984f1497ba7dea43f60163 Mon 2022-05-09 08:50:10 CEST—Mon 2022-05-09 09:05:03 CEST
-5 d30aa08d14f54dc2a3b412f8f3738b85 Tue 2022-05-10 09:30:20 CEST—Tue 2022-05-10 09:41:46 CEST
-4 03759ec71b984a73b9e577130fa21626 Wed 2022-05-11 10:31:05 CEST—Wed 2022-05-11 10:40:36 CEST
-3 f9913cc67e0e49ae8323829c43838741 Thu 2022-05-12 09:25:45 CEST—Thu 2022-05-12 09:40:44 CEST
-2 472f92993a7b4d5b9a48f85223160ec7 Fri 2022-05-13 10:12:50 CEST—Fri 2022-05-13 10:40:21 CEST
-1 bc878a0a745c4009a68b625c30a0c9e2 Sat 2022-05-14 10:31:51 CEST—Sat 2022-05-14 10:53:42 CEST
 0 f4dd9da7701b4f96b76396842934ddf4 Sun 2022-05-15 10:33:15 CEST—Sun 2022-05-15 10:51:56 CEST
root@debian:/# journalctl --vacuum-time=3days
Vacuuming done, freed 0B of archived journals from /var/log/journal.
Vacuuming done, freed 0B of archived journals from /var/log/journal/ac27c4f71b94428396fc1096906bddb6.
Vacuuming done, freed 0B of archived journals from /run/log/journal.

What's wrong?