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:
| Number One(s) | Artist(s) | Song(s) — Weeks | Issue Years | Whole Weeks |
| --- | --- | --- | --- | --- |
| 2.0 | One Direction | Up All Night — 11 | 2012.0 | 13.0 |
| 2.0 | One Direction | Take Me Home — 2 | 2012.0 | 13.0 |
| 2.0 | Rihanna | Talk That Talk — 1 | 2012.0 | 2.0 |
| 2.0 | Rihanna | Unapologetic — 1 | 2012.0 | 2.0 |
| 2.0 | Luke Bryan | Spring Break...Here To Party — 1 | 2013.0 | 2.0 |
| 2.0 | Luke Bryan | Crash My Party — 1 | 2013.0 | 2.0 |
| 2.0 | Justin Timberlake | The 20/20 Experience — 3 | 2013.0 | 4.0 |
| 2.0 | Justin Timberlake | The 20/20 Experience: 2 of 2 — 1 | 2013.0 | 4.0 |
| 2.0 | Katy Perry | Teenage Dream: The Complete Confection — 4 | 2012.0 | 5.0 |
Question:
What is the longest number of weeks any 1 song was at number #1?
Answer:
13.0