Hi ,
As with everything in Blueprints, you can do a few different ways. My suggestion would be to use a Timer in your Game Mode. Have it update a UMG Text Block component that displays on the player’s HUD. As that timer updates, you can compare the “Time” to a “Finish Time” variable and when it hits that time, pause the timer and display a message via UMG.
is just a basic idea, let me know if you have any other questions and I will see what I can do.