how long does it take to get a HK visa for my myanmese maid, we would like to visit HK

1.You are required to apply at the China Visa Application Service Center in Singapore.
2.Regular pick-up time is the fourth working day. The Centre offers express service and rush service. For express service, visa will be ready for collection on the third working day. For rush service, visa will be ready for collection on the second working day.