As of March 2018, Machines Service Centre is able to cut down the battery replacement service for iPhones in this program to 4 hours (within same day) or the following working day if submitted by 3PM.
Standard service turnaround is expected if there are other repairs that is required before the battery replacement service can be applied. Delay to be expected if there are other additional services required, and if service backlog exceed expectations.
Standard repair turnaround time for other devices are still estimated 7 - 10 working days (excluding weekends and public holidays). Repairs may take longer subject to parts availability.