click and get the time multiple times

Hi,

I'm writing a subvi that should give me the elapsed time in 5 different times. I put some booleans and connected them to the time elapsed in case structures. so if rue it gives me the elapsed time,. however i am running the vi as a subvi in a while loop. 

as i make the boolean true, it changes continously with the value of time elapsed. I just want the time instance when it becomes true.

any help will be greatly appreciated :)

Darya