But... to give an idea of the possibilities, I created a 100ha survey. Not knowing any of the parameters desired by the OP, I just kept the defaults my ST16s gave me (or was set to previously).
Camera: E50
Area: 100ha
Image count: 1105
Batteries: 6
Distance: 29,810 m
Time: 1 hour, 39 minutes
Altitude: 138.5m
Ground Resolution: 3 cm/px
Camera: E90
Area: 100ha
Image Count: 377
Batteries: 3
Distance: 16,758 m
Time: 55 minutes
Altitude: 138.5m
Ground Resolution: 4.06 cm/px
As arruntus states, breaking up the mission into smaller chunks, assuming accessibility to each "chunk" complete with launch/landing clearance, the math speaks for itself, no?
Hope this helps to give some idea of the capabilities, in its non-scientific, non-absolute, your mileage may vary, as is, for hypothetical purposes only.
Jeff