syslog: log line length?

I have most entries split over several lines:

Jun 29 19:56:40 db.xxx.xxx postgres[10640]: [5-1] DB=XXX U=XXX H=1.1.1.1 16854186.2190 idleLOG: Verbindungsende: Sitzungszeit: 0:01:22.10
Jun 29 19:56:40 db.xxx.xxx postgres[10640]: [5-2] Benutzer=xxx Datenbank=xxxx Host=1.1.1.1 port=23640

Is it possible to tell postgres to split entries only after 200 chars, not already at about 80?
200 should fit most log lines into one entry.

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