According to Official Guinness Records,
The longest marathon playing ice stock sport (target shooting) is 40 hr 5 min 43 sec, achieved by SV Neureichenau and Günter Wagner (both Germany), in Neureichenau, Germany, on 11-12 August 2017.Although the sport is traditionally played on an ice surface, events are also held on tarmac in summer, which was done by SV Neureichenau and Günter Wagner.
For a complete list of 2017 records, please visit 2017 Guinness Records in Germany.