Janitorial service at the Landesgymnasium für Musik Wernigerode.

2 x 8 hours and 1 x 5.5 hours / working day for 210 working days per contract year for a maximum of 5 years (3 years + 2 extensions possible) = 4 525 hours per contract year x max. 5 years = 22.575 hours janitorial service.