Our system is set up to do a complete sync between your Magento store, the system and linked Marketplace once every 24 hours, usually at midnight. 

A full sync includes updating all product information including images, descriptions, price, inventory, titles etc. between Magento, our system and your linked Marketplaces

In between each product sync, inventory is updated across the system and your linked Marketplace every 20-30 minutes, this will vary depending on the number of products and speed of Magento server.