The ones that are okay are: Vilken tid vaknar du? Hur dags vaknar du? När vaknar du? The difference is that "När" doesn't imply a time, not even a specific point in time, so it could be a week, a month, a year, a decade or an era. Or it could be a specific point in time. It could be whatever time measurement. - När föddes du? (When were you born?) - Åh, det var på 1970-talet. (Oh, it was back in the 1970's.) - Vilken tid föddes du? (What time were you born?) - Jag har för mig det var runt klockan 13. (I believe it was around 1pm.) - När ska vi gå? (When are we leaving?) - Om fem minuter. (In five minutes.) - Vilken tid ska vi gå? (What time are we leaving?) - 17:50. (5:50pm.) "Hur dags" also refers to a specific point in time, it means "When, during the day" and it is not as exact as "Vilken tid". - Hur dags vaknar du? - Vid 8-tiden. - Vilken tid vaknar du? - 7:58.