Here is wish list ideas for your app. Some suppose that the player has a supervisor that does not witness each session and/or wants to keep a record of progress.
When the count is greater than 2 keep the duration of each press (perhaps to a limit of 300 seconds. That's 5 minutes. When the session is over display a histogram of the durations up to the maximum duration, the value of the min, average, max, and median durations.
Short of that, append the date, time and values above to a new line of a text file. The player can send this file to a supervisor.
It may also help to tick each second while the button is pressed. If you have several different types of ticks use an alternate sound on multiples of 5 and 15 seconds. This will aid the player to reach goals.
Keep a sequence number of/for each session. This will let the supervisor know of otherwise secret sessions.
Add a feature to automatically save the screenshot of the session results in a defined folder.
The player may send these images to a supervisor for review.
To prevent cheeting (pressing with a finger rather than nose): Take a low resolution picture at the instant the button is released. Stitch these images in a grid into a larger image saved in a designated folder. The date, time, and serial number of the session could be in the image.
An old software engineering saying ...
Never make anything simple and efficient when it can be complex and wonderful.
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