Here are my build times for the legacy RV-12. I have the plans for the iS and would agree that it is a bit more complex in places, but adding 10% to the fuselage build hours should be reasonable for estimating:
Empennage 116 hr
Wings 212 hr
Fuselage 221 hr
I did not include my Avionics or Firewall forward since the iS is significantly different in those areas. Until someone publishes their iS build times, I guess these will have to do.
If I were building now, I would always have the next kit on hand or on order to avoid long down times. This plane builds fast if that's your goal!
E-LSA RV-12 ULS