The visa policy has just recently changed. The Ambassy gives no longer 30 days, but 60 tourist visas!
This says the website (www.indonesia.nl)
Tourist Visa Policy
As of July 7, 2004 the Indonesian Embassy in The Hague will extend the duration of stay in Indonesia for tourist visa holders from a maximum of 30 days to a maximum stay of 60 days. The tourist visa cannot be extended.