| A | How Long | 3:09 |
| B | Sniffin' About | 4:44 |
| Category | Artist | Title (Format) | Label | Category | Country | Year |
|---|---|---|---|---|---|---|
| 5C 006-96 008, 5C 006-96008 | Ace | How Long (7", Single) | Anchor , Anchor | 5C 006-96 008, 5C 006-96008 | Netherlands | 1974 |
| D-2777 | Ace | How Long (7", Single) | Goldies 45 | D-2777 | US | 1975 |
| ANC-21000 | Ace | How Long (7", Single, Mono, Promo) | Anchor | ANC-21000 | US | 1975 |
| D-2777 | Ace | How Long / Sniffin' About (7", Single, RE) | MCA Records | D-2777 | US | Unknown |
| 2C 004-96.008 | Ace | How Long (7", Single) | Anchor | 2C 004-96.008 | France | 1974 |
| A | How LongWritten-By – Carrack* |
| B | Sniffin' AboutWritten-By – King*, Carrack* |
| Category | Artist | Title (Format) | Label | Category | Country | Year |
|---|---|---|---|---|---|---|
| D-2777 | Ace | How Long (7", Single) | Goldies 45 | D-2777 | US | 1975 |
| ANC-21000 | Ace | How Long (7", Single, Mono, Promo) | Anchor | ANC-21000 | US | 1975 |
| D-2777 | Ace | How Long / Sniffin' About (7", Single, RE) | MCA Records | D-2777 | US | Unknown |
| 2C 004-96.008 | Ace | How Long (7", Single) | Anchor | 2C 004-96.008 | France | 1974 |
| 1C 006-96 008 | Ace | How Long (7") | Anchor | 1C 006-96 008 | Germany | 1974 |
| A | How Long | 3:15 |
| B | Sniffin' About | 4:40 |
| Category | Artist | Title (Format) | Label | Category | Country | Year |
|---|---|---|---|---|---|---|
| 5C 006-96 008, 5C 006-96008 | Ace | How Long (7", Single) | Anchor , Anchor | 5C 006-96 008, 5C 006-96008 | Netherlands | 1974 |
| D-2777 | Ace | How Long (7", Single) | Goldies 45 | D-2777 | US | 1975 |
| ANC-21000 | Ace | How Long (7", Single, Mono, Promo) | Anchor | ANC-21000 | US | 1975 |
| D-2777 | Ace | How Long / Sniffin' About (7", Single, RE) | MCA Records | D-2777 | US | Unknown |
| 2C 004-96.008 | Ace | How Long (7", Single) | Anchor | 2C 004-96.008 | France | 1974 |