icemaw--
Yes, if you reduce the city to 0% at the same time, too. That's my understanding. However, the enemy could start sending waves of C-47's with supplies to the fields, factories, and cities. Each one will reduce that time by 15 minutes. In addition, each auto-supply train or convoy will reduce times by 30 minutes.
So, the three-hour downtime is more hypothetical than real.
Last week, AcId, Beefcake, and I bombed an enemy troop training facility with B-24's carrying 8 x 1,000 lbers. In one 5-second pass we reduced it from 100% to 20%. Since the sector city (OZKansas map) was already at 35%, the troop training facility stayed low for quite a while. [One and a half hours, or so. I don't know if anyone resupplied it.]
For the gory details, go to the HTC web page, click on "Help", then "Strategic Targets"
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I'd like to very sycophantically say that HTC has been the most communicative and responsive company I've ever dealt with. They really do listen. I think it's great that hitech is reading these posts all the time. He may only have responded to one that was critical, but I bet he read my opinion, too.
MRPLUTO