I hope normal size are coming out now as stated by knreed.

Judging from the two assignments that I got - one at 25% complete and one at 50% complete, it looks like 9-10 hours jobs instead of the 14-15 hours job.

It used to take 6-7 hours on my system.

The downside of Sekerob's 4 suggestions for keeping your computer running a bit cooler in summer (and all other times too) is that you'd end up crunching significantly fewer WUs. If and only if you're technically savvy and/or adventurous and your relationship with the computer owner permits, I can think of a couple of other options.
Without spending any money, you may be able to reduce the voltage(s) supplied to the CPU and other components. You may or may not have to reduce the computer speed a little too, which would reduce your crunching speed, but you'd achieve your cooling with a smaller speed reduction this way. After the laughter stops, you might get useful advice from overclockers' fora (1 forum, 2 fora).
The other approach requires spending money on hardware to improve your computer's cooling. This option may not be available on Macs, and for notebooks the best you could do would be to get a notebook cooler pad or even leave the machine in the breeze of a desktop fan. For PC-style machines I'd start by upgrading the CPU heatsink and fan. The test results at [url=http://www.frostytech.com/top5heatsinks.cfm] Frostytech.com may be a useful guide. Don't forget ventilation and airflow inside the case. Warnings: Running a non-standard CPU cooler may void the CPU warranty. You must use thermal grease - just a very thin layer - between the CPU cap (heatspreader) and the heatsink. If the paste is silver, do not get it on any of the CPU connecting pins or any parts of the motherboard as it conducts electricity and may cause a short-circuit. If the heatsink is big and heavy, your motherboard will be vulnerable to damage if the computer is jolted, so remove the HS if the computer is to be transported by unknown persons!
Happy crunching.
----------
As for the longer FAAH WUs - who cares if they're longer, provided you can return them in time. Getting the research done is the bottom line, not points awarded or absolute no of WUs done. (I'm looking at this thread only because I wondered whether something in my machine had slowed it down.)

7.5 hours on my clovers and app 7 hours on the Q6600 at 3600mhz.
You need some faster machines my friend!

No, on my mashines I still run 6.03... Any how, as far as I understood, it's only a matter of the grafical interface, so there seems to be no change in the core, and no change in the length of the calculation time...

Correct me, when I'm wrong...

They will run faster than the project average which on yesterday´s production was 10 hours (graph up in this thread). One poster wrote a little up in here, that his machines did 7 to 7.5 hours.... mine does 8 but I don't overclock. Best place to look for advise is the Chat Room where some threads are running on the best configurations.

As for 6.03-6.04 that was only a bug fix. Actually have both running side by side this moment. They are compatible, which is why WCG did not have to drain the work before starting the circulation of the new version.