我去google搜了一下，它自己没有宣传网页。

不过刚好手上有Giant的promotion newsletter, 摘点有用的信息给大家看看。

Giant IMM
9am-11pm daily
sat till 1am
shuttle bus: seems to be from 9:30am -9:30pm
at clementi: the bus stop just outside the Mcdonald, where there are a number of bus routes
at JP: on the road behind Boon Lay MRT station. Notice that that bus stop has no regular bus route. it is particularly used for shuttle busses and company buses
at IMM: hehe, everyone should know the place--outside Long Beach Seafood restaurant
frequency: 20min

Giant Turf City
9am-10pm daily
sat & sun till 11pm
shuttle bus: i cannot remember the period, but surely you can take it during daytime
at clementi: inside Clementi bus terminal. the same place where you wait for bus 96
at Turf City: the place where you took off the bus :)
frequency: 30min

hope this helps!