[Alan Anderson]

Here's how I would do it. This code can go in either Teleop or one of the Periodic Task loops.

The part with a green right-facing feedback node and a "greater than" is a standard LabVIEW idiom for getting a single TRUE pulse when a button is first pressed.

The part at the top left is computing a boolean output saying whether or not the current tick count has reached a saved value, and setting that value to 500 ms in the future when it gets the "button has just been pressed" signal.