{{msg-mw|ago}} cannot work

In Colognian, the best way to combine the various durations would be to make it a list - in English that is "A, B, C and D" - examples:

• För eine Menutt
• För 7 Stunde un 2 Menutte
• För 3 Dääch, 2 Stunde, un 4 Sekunde
• För eine Woch, einem Daach, un eine Sekund

This is not good, but likely the best, we can get with current software. But inside sentences or similar structures, we should not write figures up to 12 using digits, but rather should spell them out like "twelve".

Also, we need to have an eye on declensions depending on wording:

1 day ago

för einem Daach

1 day long

för eine Daach

although these may be mutually embedded in sentence contexts making them effectively mean the same.