End-to-end journey times on the nine lines in the system range from 36 minutes (on line S7) up to 87 minutes (on line S1). The longest journey time into central Frankfurt (Hauptwache), from any point on the network, is 54 minutes. Services on some lines start shortly after 4a.m., while all lines have services from about 5a.m. onwards. A full service is maintained from 6a.m. until about 8p.m., and a somewhat reduced service is run until the late evening. The last services leave Frankfurt at about 1:20 a.m. The S8/S9 runs 24/7.