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:
| No. in series | No. in season | Title | Directed by | Written by | U.S. viewers (millions) | Original U.S. air date | Prod. code |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 50.0 | 1.0 | "Backstage Rush" | Stewart Schill | Scott Fellows | 2.3 | May12,2012 | 301.0 |
| 51.0 | 2.0 | "Big Time Returns" | Scott Fellows | Scott Fellows | 2.3 | June25,2012 | 302.0 |
| 52.0 | 3.0 | "Bel Air Rush" | David Kendall | Mark Fellows & Keith Wagner | 2.9 | July2,2012 | 303.0 |
| 53.0 | 4.0 | "Big Time Double Date" | Joe Menendez | Jed Spingarn | N/A | July9,2012 | 304.0 |
| 54.0 | 5.0 | "Big Time Merchandise" | Carlos Gonzalez | Jed Spingarn | N/A | July16,2012 | 305.0 |
| 55.0 | 6.0 | "Big Time Surprise" | Julian Petrillo | Scott Fellows | 2.9 | September22,2012 | 306.0 |
| 56.0 | 7.0 | "Big Time Decision" | Jonathan Judge | Lazar Saric & Jed Spingarn | 2.4 | September29,2012 | 307.0 |
| 57.0 | 8.0 | "Big Time Babysitting" | Jonathan Judge | Dan Serafin | 2.8 | October13,2012 | 308.0 |
| 58.0 | 9.0 | "Big Time Gold" | Nisha Ganatra | Mark Fellows & Keith Wagner | 2.6 | October20,2012 | 311.0 |
| 59.0 | 10.0 | "Big Time Camping" | David Kendall | Lazar Saric | 2.5 | October27,2012 | 309.0 |
| 60.0 | 11.0 | "Big Time Rescue" | Joe Menendez | Lazar Saric | 2.6 | November3,2012 | 310.0 |
Question:
How many different original U.S. air dates appear where the U.S. viewers were 2.5 million?
Answer:
1.0