Answered by Peter
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Dec. 30, 2015 00:55
The free subway is only valid for three days. If you still wanna use this as a Standard Octopus Card after three days, you need to reload some money on it. You can consider that how many days you stay in HK. And then you can decide how much money you reload the card.
BTW, the unused balance can be refunded. so no worry.