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Dänemark| Label: | Anchor Records ANC 1002 |
| Genre: | Rock |
| Style: | Classic Rock |
| Format: | Vinyl (7") |
| A | How Long | |
| B | Sniffin' About |
| Label: | Anchor Records ANC-21000 |
| Genre: | Rock, Pop |
| Style: | Classic Rock |
| Format: | Vinyl (7" , 45 RPM , Single) |
| A | How Long » Written-By: P. Carrack | 3:09 |
| B | Sniffin' About » Written-By: A.B. King, P. Carrack | 4:44 |
| Label: | Old Gold (2) OG 6304 |
| Genre: | Rock |
| Style: | Classic Rock |
| Format: | CD (Single , Reissue) |
| A | How Long » Written-By: Paul Carrack | 3:23 |
| B | Sniffin' About » Written-By: Alan King, Paul Carrack | 4:42 |
| Label: | Polydor POSP 416 |
| Genre: | Rock |
| Style: | Classic Rock |
| Format: | Vinyl (7") |
| A | How Long | |
| B | I'm Not Takin' It Out On You |
| Label: | Anchor Records 2C 004-96.008 |
| Genre: | Rock |
| Style: | Classic Rock |
| Format: | Vinyl (7" , Single) |
| A | How Long » Written-By: Carrack | |
| B | Sniffin' About » Written-By: King, Carrack |
| Label: | Anchor Records 5C 006-96 008 |
| Genre: | Rock |
| Style: | Classic Rock |
| Format: | Vinyl (7" , Single) |
| A | How Long » Written-By: Carrack | |
| B | Sniffn' About » Written-By: King, Carrack |
| Label: | MCA Records MCA D-2777 |
| Genre: | Rock |
| Style: | Classic Rock |
| Format: | Vinyl (7" , Reissue) |
| A | How Long | |
| B | Sniffin' About | |
| Label: | Goldies 45 D-2777 |
| Genre: | Rock |
| Style: | Pop Rock |
| Format: | Vinyl (7" , 45 RPM , Single) |
| A | How Long » Written-By: P. Carrack | 3:09 |
| B | Sniffn' About » Written-By: A.B. King, P. Carrack | 4:44 |
| Label: | Not On Label (Ace (7)) TRO 5 |
| Genre: | Electronic |
| Style: | House |
| Format: | Vinyl (12" , 45 RPM , White Label , Unofficial Release) |
| A | How Long | |
| B | How Long |
| Label: | Anchor Records 17 978 AT |
| Genre: | Pop, Rock |
| Style: | Ballad, Classic Rock |
| Format: | Vinyl (7" , Reissue , 45 RPM) |
| A | How Long | 3:24 |
| B | Sniffin' About | |
| Label: | Polydor 2059 468 |
| Genre: | Rock |
| Style: | Classic Rock |
| Format: | Vinyl (7" , 45 RPM) |
| A | How Long » Producer: John Anthony | 3:15 |
| B | I'm Not Takin' It Out On You » Producer: Trevor Lawrence | 3:24 |
| Label: | Anchor Records ANC 1002 |
| Genre: | Rock |
| Style: | Classic Rock |
| Format: | Vinyl (7" , 45 RPM) |
| A | How Long | |
| B | Sniffin' About |
| Label: | Anchor Records 1C 006-96 008 |
| Genre: | Rock |
| Style: | Classic Rock |
| Format: | Vinyl (7" , 45 RPM) |
| A | How Long » Written By: Carrack | 3:19 |
| B | Sniffn' About » Written By: Carrack/King | 4:41 |
| Label: | Anchor Records ANC 1002 |
| Genre: | Rock |
| Style: | Classic Rock |
| Format: | Vinyl (7" , Single) |
| A | How Long » Written-By: Carrack | |
| B | Sniffin' About » Written-By: King, Carrack |
| Label: | Eric Records 6504 |
| Genre: | Rock, Pop |
| Style: | Classic Rock |
| Format: | Vinyl (7" , 45 RPM , Reissue) |
| A | How Long Ace | 3:20 |
| B | In A Broken Dream Python Lee Jackson » Featuring: Rod Stewart | 3:35 |
| Label: | MCA Records D-2777 |
| Genre: | Rock |
| Style: | Classic Rock |
| Format: | Vinyl (7" , Single , 45 RPM) |
| A | How Long » Written-By: P. Carrack | 3:09 |
| B | Sniffn' About » Written-By: A. B. King, P. Carrack | 4:44 |
