Hey Guys, here's some more info on the R-09 after testing the highest sample rate with NiMH batteries...
I followed Rick's eggtimer suggestion so that when I ran out of memory on my 1GB Sandisk card, I quickly deleted the file and started recording again, so the time should be pretty close to continuous recording with a larger card.
This time I recorded at 24bit/48kHz WAV and my NiMH Eveready 2500mah batteries lasted approx. 6 hours and 5 minutes!!! (58 minute files x 6, plus 17 minutes in the last file)
Very good battery time, in my opinion! And much more than the quoted 4 hour record time with alkaline batteries from the specifications. I have yet to test alkalines at this bitrate and sample rate, but I'll get to it soon!