According to Official Guinness Records,
The fastest time to complete the Guinness World Records Rocket League training time trial is 1 min 22.32 sec and was achieved by Harvey Morris Daws (UK) in Birmingham, UK, on 26 August 2018.The record was set at a Guinness World Records live attempt arena at Insomnia63 gaming festival at the NEC in Birmingham.
For a complete list of 2018 records, please visit 2018 Guinness Records in United Kingdom.