So... down to 80%. Results:
9 hr 10min on 20% battery.
Aditionaly i leave for lunch to a local restaurant for about an hour and no more wifi, so thats 1 hour on hspa+, which as you can see jumps to 3g from now and then.
27 min of screen time.
12 min 43s of voice calls.
At this point i will consider this as "average usage" and i will now proyect battery five-fold to see theoretical numbers:
100-0% 45 hrs (1.9 days)
2 hrs 20 min of screen time
Wifi on with a bit of Data time
1 hour of voice calls
Lots of texting included with those 2 hours 20 of screen time
So its 1:12 in the afternoon. if i do go to do field work and take piictures then i will not be able to continue every 10%. otherwise i may post more as time passes by.
For now, this is my usage as of 20% in 9 hours of battery, everything stock. Hope this helps.