Hi,
The timestamp that PennController reports for Controller elements corresponds to when it ended; in this case, it corresponds to when the last word disappeared. Because you printed the Text element with your question immediately after waiting for the Controller element, the timestamp reported for the latter is a good approximation of the former. S subtracting that timestamp from the timestamp of the keypress gives you 1651092196900-1651092191988=4912ms, ie. about 5s
Jeremy