For the first one, simply set a TimeOut value on the Destroy Bridge objective for red. If they don't complete it within the allotted time, then blue wins. You don't need to set a Defend Bridge target for blue on the same bridge.
For the second, if the ships in the convoy are moving, you unfortunately have to have a Destroy target for every ship in the convoy, so you can't assign a % of the convoy to be destroyed - everything tagged with the Destroy target will have to be sunk. If they're stationary however, then a Destroy Ground will work.
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