sorry, it's about 4500 from member list, not several hundreds,
so, it's due to the time zone?
Possible.
Btw, it seems 99.9% of the accounts registered on Mar 9 and Mar 10 are made with bots with meaningless names like "iyeiao6hv8" and "wjho3f8dy".
https://bitcointalk.org/index.php?action=mlist;sort=registered;start=268200IMO, theymos should prune those accounts (no activity at all after almost 3 months)