Depends if you do a simple conversion or a proper converstion
Simple: couple days, quick and dirty
Proper:
- Convert multiple textures to merged format
- Fix model mapping problems caused by merged format
- Find and replace any BIS's own OFP textures used
- Create full Skeleton definition
- Create full Model definition
- Define damage animations
- Generate normal maps
- Generate spectra maps
- Generate normal RVMATs
- Generate damage RVMATs
- Research vehicle ingame dynamics by experiementing with config
- Redo most ammo, magazine and weapon definitions
- Redo cargo/driver/gunner actions in config
- New icons and picture icons
- Convert most sqs files to sqf
- Create Shadow LODs in p3d
- redo people and weapon proxys in p3d
As I said elsewhere, 320hrs into converting Footmunchs Su33 to ArmA, and I'm only 3/4 finished