Hi yucu, apologies for the late answer. I’m afraid I don’t completely understand the question, though. Could you elaborate on what you want to achieve mechanically? Is this a turn timer that ends the turn when it has reached a value? Without knowing more of exactly what you want to achieve it is difficult to make specific recommendations. It sounds like something you could do in BP_TurnManager. Have an integer variable that you increment every second, bind this integer to a text widget, check the value in the turn manager each time it is incremented and fire you end game event when it reaches a specified value. Something like that, though it depends on exactly what you want to achieve.
I have not heard from them yet. Apparently the marketplace team is pretty overwhelmed at the moment. Seems like a lot more people have begun submitting assets during Corona lockdown.