I have owwed several cars in the past that have had timing belts. The test has always been a 90deg twist along the longest length. That should be fine.
Mine was factory set and checked by dealer to 30° twist. Still the same after 2000+ miles.
Richard
2018 Roadster 3.7 1966 Land Rover S2a 88 2024 Royal Enfield Guerrilla 450 1945 Guzzi Airone