What principle does Trade Republic use to implement ETF savings plans?

Hello everyone, I have a question about the ETF savings plans at Trade Republic. With my old ETF (UBS MSCI World), the savings plan was usually executed in the morning between 9 and 10 a.m. My current Vanguard FTSE All-World, on the other hand, runs more in the late afternoon between around 5:30 p.m. and 6 p.m. Does anyone know what principle Trade Republic uses to determine the execution time? Does it depend on the ETF, spread, liquidity, trading venue or any internal collective orders? I would be interested