I have been conducting slightly less scientific battery tests for my weather station project:
I pushed some updated code to GitHub over the weekend that reads the sensors once every 15 minutes and puts the core into a deep sleep for everything in between (around 14 minutes sleep time per loop which allows for re-connection after the core reboots and flashing the core if I want to update it). My battery is twice the size (1200mAh) and I disabled the onboard LED to save some extra juice. I also have sensors attached which are drawing extra power.
It just gave up after starting it on Sunday night. My total uptime is 1 day, 10 hours and 30 minutes (34.5 hours) which I am fairly pleased about but are perhaps a little shy of your tests at the moment. I am hoping this should be plenty with the right solar panel.