Web analytics reports - acceptable response?

We generate some very large custom server logs in order to generate web analytics reports which include much more data than a standard server log.
For one site the gzipped daily log files are about 10MB and this equates to daily PIs of approx 500k.
Now, we have used some cutting edge database technology to process this data fast enough to provide the customer with reports in real time - how fast would people say was acceptable.
At the moment, for example, running a monthly PIs report in real time takes 20-30 seconds to produce a web based report (graphs are SVG) - would you be happy with this or is it still too slow?

Your comments would be much appreciated.

 

 

 

 

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