Yes, for my Taobao / China and Japan shopping service, non-perishable items can be stored for free for up to 6 months (180 days) from the time your purchase arrives at the warehouse. After 6 months, your purchases may be disposed of if shipping arrangements are not made.
For Taiwan shopping service, there’s no charge for storage, and there isn’t a specific deadline for storage period, but the consolidation location is a residential house, not a warehouse. The faster you can have your items shipped, the better.