I'm guessing he means a timer until the same spell is cast again, in other words, ACT without ACT.
In theory one might be able to make it so you could press a button when you see a spell you want tracked to start an arbitrarily long timer, then capture the timer state when the noted spell name is cast again. There would be lots of opportunity for mistakes and inaccuracy in such a method but it could potentially be a quick and dirty timer generator if you somehow can't run ACT.
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