A single is considered 1-3 songs that are each less than 10 minutes in length.
When releasing a single, don't add “- Single” to your track or album titles.
Stores will do that for you if they need it.
An EP is considered 1-3 songs with one song of at least 10 minutes in length and a total running time of 30 minutes or less.
Or an EP is considered 4-6 songs with a total running time of 30 minutes or less.
Include “- EP” at the end of your album title if it fits this definition.
An album is considered to be 6 or more songs running over 30 minutes in length.