How to make my ui disappear when timeline over

i'm new to unity, so its probably obvious, but i can't find it !
I have a money income that play on the ui whenever i gain or lose money, the Text is on a time line that is trigger whenever one of the two situation occur. however, i want the "+25$" to spawn for one second and then disappear, but now, as soon as it spawn once. it sticks in the screen until an other income or outcome occur to reset the timeline. anyway around that ? thanks !