If the apartment is a normal level of dirty, the following time and effort can be expected. In the case of heavier soiling, the number of hours can vary significantly!
1-room-apartment 5-8 hours  2-room-apartment 6-10 hours  3-room-apartment 9-14 hours  4-room-apartment 10-20 hours  Larger apartments 15 Stunden hours or more
However, if the apartment is in a bad overall condition, a deep cleaning may be necessary. A deep cleaning is much more complex and expensive than the final cleaning of a well-kept apartment. It is therefore worthwhile to treat the apartment with care!
The costs for a professional cleaner through a cleaning company (i.e. insured and taxable), are approximately between € 25,- to € 29,- per hour. Cleaning supplies are generally included. The costs for the journey to and from the apartment are usually charged additionally. If the service provider is not a professional, the hourly costs are lower.