Inventory is synched between the eBay and your eCommerce store at a minimum of once per day.

You can set this up to synch more frequently e.g every 4 hours by going to 'settings' then 'Administration' then look for the field 'Refresh product feed at hour'. Add additional times here to synch automatically throughout the day.

You can also manually trigger a feed by clicking the ‘Synch now' button on the dashboard.