Hmm I see that you are implying that the war will restart when there are inactive 20minutes in and there will be still a 1hour long war. However this isn't feasible. Since teams are mixed up before the war "continues" (which I assume continues from 0 plunder on both sides), war commanding wouldn't be an option and cc would be super chaotic. And by the war continues, I assume you mean a full 1 hour duration? If so you are taking away 20minutes of someone's time which they may go inactive for the last 20 minutes....
It merely resumes the previous war with the same amount of time remaining. But I'll try to fix it so there are no misinterpretations such as yours.