Unfortunately, the battery tests were disappointing, only 33 hours...

assuming that the battery capacity was correct (1000mAh) and that all of it was used before the boost circuit collapsed...

1000mAh @ 3.7V = 3700Wh

3700Wh / 5V = 740mAh

740mAh / 33h = 22mA (AVG) spread across the booster, RTC , Arduino and SD card which isnt too bad really

redesign:

The SD card will be turned around so that its accessable from the end with the USB port and the wires allowing the whole lot to be put into a tube of heatshrink.