Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| 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 |
| Captive-inert flight #3 | February 25, 1977 | mph (km/h) | 26,600ft 8,108 m | none | 2 h 28min | Tailcone on, landed with 747 |
| Captive-inert flight #4 | February 28, 1977 | mph (km/h) | 28,565ft 8,707 m | none | 2 h 11min | Tailcone on, landed with 747 |
| Captive-inert flight #5 | March 2, 1977 | mph (km/h) | 30,000ft 9,144 m | none | 1 h 39min | Tailcone on, landed with 747 |
| Captive-active flight #1 | June 18, 1977 | mph (km/h) | 14,970ft 4,563 m | Haise , Fullerton | 55min 46 s | Tailcone on, landed with 747 |
| Captive-active flight #2 | June 28, 1977 | mph (km/h) | 22,030ft 6,715 m | Engle , Truly | 62min 0 s | Tailcone on, landed with 747 |
| Captive-active flight #3 | July 26, 1977 | mph (km/h) | 30,292ft 9,233 m | Haise , Fullerton | 59min 53 s | Tailcone on, landed with 747 |
| Free flight #1 | August 12, 1977 | mph (km/h) | 24,100ft 7,346 m | Haise , Fullerton | 5min 21 s | Tailcone on, lakebed landing |
| Free flight #2 | September 13, 1977 | mph (km/h) | 26,000ft 7,925 m | Engle , Truly | 5min 28 s | Tailcone on, lakebed landing |
| Free flight #3 | September 23, 1977 | mph (km/h) | 24,700ft 7,529 m | Haise , Fullerton | 5min 34 s | Tailcone on, lakebed landing |
| Free flight #4 | October 12, 1977 | mph (km/h) | 22,400ft 6,828 m | Engle , Truly | 2min 34 s | Tailcone off, lakebed landing |
| Free flight #5 | October 26, 1977 | mph (km/h) | 19,000ft 5,791 m | Haise , Fullerton | 2min 1 s | Tailcone off, runway landing |
Question:
What is Duration, when Test Flight is Taxi Test #2?
Answer:
taxi