Don't know how long that would take (with beta testing and bug hunting that could take a while), it would be a waste of time anyway, because the only real benefit would be more than 4 GB memory address, which is unnecessary anyway and no 32bit user could even start ROF or connect to 64 bit version servers (maybe fastaer loading times also, but that's still not worth it). 4 GB is enough and this could be accomplished easily by setting the flag, which takes me less than 10 seconds but they would have to change their DRM, because it will change the checksum of the ROF.exe, so maybe one hour tops.

I just hope they figure something out, Its not a lot of fun owning the Cadillac of WWI sims when the best you can do is back it out of the garage and look at it.