Yes, you can add a function that checks the current time and it it exceeds a set time it will bypass the script. The only issue with this is that the scripts can't store the time the trial started, so it would have to be coded in when the script is distrubuted, or you would have to have the script create some sort of file CSV, xml, or txt file that could store that value, but the user could most likely modify that file too. If you don't save as a binary file, it would also be extremely easy to bypass this.
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