I was always under the impression that the reasoning for the JW statement that war in heaven took 3-4 years was because they equated the heavenly war with satan with the fact that certain brothers(GB?) were locked up in jail and weren't released till 1918(or was it 1919).
War started in heaven, brother put in jail (1914)
Satan defeated, brothers released (1918)
I may be wrong... but I asked this question way back when I was still in and didn't get any satisfactory answers just a bunch of opinions...
Cheers DK