How can I create a timer that counts up and stops when reaching end of level?

The simplest form of timer you can create if you just want to be able to track what time has elapsed since the game started is this:

Unfortunately you can’t pause this timer so if you want to print a value of the time to a scoreboard when the player finishes the level then this won’t work. I’ve created a Timer Blueprint that I want to add to the Marketplace for free… we’ll see if they let it through. If not, I’ll make a tutorial video.