How long is a piece of string?
"and what will be a max range in this conditions?"
Depends on the height you fly, the temperature you fly at and whether or not you are in a hurry.
For example 10'000 feet @+10 degrees C, range is 468 nm at recommended cruise power and it will take you 4.5 hours whilst at Fast Cruise your range is 460 nm and the flight time is 4.05 hours (both 'tanks dry' figures). It would be further if you go higher but we can't (no oxygen).
NOTE: Pop-outs have no performance penalty in the cruise, only in the climb.
The real interesting calculations on the EC 120 are when you have less than 100 kg of fuel. You will then have payload available that you can't use!