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(2 edits) (+1)

I'm unable to succeed. When will an all-clear ever be announced during a match?

[edit] So I got an all-clear twice and was able to fulfill the mission one of those times but I don't understand when the all-clear is triggered. Is it explained on any of the pages? Or is it not supposed to be?

(+1)

The all-clear is given based on time. It shows up (IIRC) 8-12 minutes after the operation start. There is some randomness to the finish time which is rewarded with a higher operation score. Note that this is at normal speed and without using fast forward. The timer is synched to the game's speed and will adjust accordingly.