What was the shortest Test cricket match ever played?

In terms of balls bowled, the drawn 2009 2nd West Indies vs England Test was the shortest ever, as only 10 balls - less than two overs - could be played.

The shortest decisive result, and possibly one of the shortest in time (it ended on the second day after 23 wickets fell on the first) was South Africa vs India, Cape Town (2024) which took 624 balls to produce a 7-wicket India victory.

https://www.espncricinfo.com/series/england-tour-of-west-indies-2008-09-352657/west-indies-vs-england-2nd-test-352662/full-scorecard
https://www.mid-day.com/sports/cricket/article/after-mcg-clash-here-are-three-shortest-test-matches-of-this-century-23609667