Measure reaction time in blueprint

Hi all,
I’d like to measure a reaction time in bp. For example, in a user interface, an item appears on a black screen and the player has to press a key as fast as possible (when the item appears). How to measure the reaction time that is to say the time (in seconds and milliseconds) between the appearence of the item and the key pressed by the player ?
I don’t know how to build it properly. Any ideas ?
Thanks for your help.

Subtract the time the item appeared from the time the key was pressed (tested & works):

It’s what i’m looking for ! Thanks very much for you help !

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