baggage storage in terminal 2, HKIA and getting back

How long does it take to get to terminal 2 from terminal 1 to get bags into storage as we are going to stay in Sri Lanka for 2 weeks and want to leave a bag of winter clothes at terminal 2 whilst there ,and then fetch the bag on return before going to China. We arrive at 9.30 am and need to collect the bag at terminal 2 and then board another flight at Terminal 1 at 2 pm