Do you want the charts to be updated when the threshold is reached ? Pls add a sample workbook.
Its sort of like Alerts in tableau. Follow this article.
You can set the amount as alert and set the refresh time of your dashboard at 4-5 minutes interval.
Let us know if this help.
It's like an alert in fact but I don't want to send it to a mail but when I identify a customer that reached that threshold AND look if it's done under 4 minutes (so not just refreshing data every 4 minutes)
TO identify customer it must use key pdv + company