Info from the tsotesting posted to settlersonlinewiki.eu and osettlers.com has
Short: 5 or 30 or nothing
Medium: 10 or 15 or nothing
Long: 15 or 25 or nothing
Very Long: 20 or 35 or nothing
Prolongued: 25 or 45 or nothing
But I've got 10 on short. Has anybody got the 30 from short or has that changed to 10?