Table:
text: Approach and Landing Tests
List of ALT flights
List of ALT flights
Test_flight Date_ Speed Altitude Crew Duration Comment_
Taxi test #1 February 15, 1977 mph (km/h) taxi none taxi Concrete runway, tailcone on
Taxi test #2 February 15, 1977 mph (km/h) taxi none taxi Concrete runway, tailcone on
Taxi test #3 February 15, 1977 mph (km/h) taxi none taxi Concrete runway, tailcone on
Captive-inert flight #1 February 18, 1977 mph (km/h) 16,000ft 4,877 m none 2 h 5min Tailcone on, landed with 747
Captive-inert flight #2 February 22, 1977 mph (km/h) 22,600ft 6,888 m none 3 h 13min Tailcone on, landed with 747

Question: What is the duration if the test flight is taxi test #2 for approach and landing tests?