Question about the calculation of reverse recovery time in MOSFET datasheet

sang960326

Hello, I would like to ask about the standard for calculating the reverse recovery time (trr) of a switching device such as a MOSFET.
When I check the datasheet, it says about the test set-up, but it doesn't seem to specify the standard for calculating trr.
For example, the time when trr starts is when the current flowing through the body diode becomes 0A, and the time when it ends is 10% of Irrm.
If there is, please let me know.