Propagation Delay Delta tolerance value in mils

Hello

I usually set relative propagation delay  delta tolerance value in mils like “0:100mils” . One of the board I received for modification having it set in “ns” and the max length difference is 311mils , but still its shows green.

Just wanted to know “0.01ns means how much in mils ? ( I consider 140ps = 1000mils  , but this doesn’t match with the constraint set in CMGR)

I referred below two document  to get the value , but unable to correlate with CMGR value .

Document ref : https://www.flowcad.ch/cms/upload/ApplicationNotes/FlowCAD_AN_PCB_Constraining_Delay_Rules.pdf

Document ref : https://www.eetimes.com/meeting-timing-specs-on-boards-with-picoseconds-of-margin/