There are two types of data being exchanged between Ibistic and your ERP system:
Outbound from Ibistic to ERP - Invoices and Expense reports
Inbound to Ibistic from ERP - Masterdata (suppliers, GL accounts, Projects, VAT accounts etc)
The times when such data is exchanged greatly depends on the integration / setup, and is in most cases based on a Task Schedule on integration server, which may be configured to your preference. Invoices are typically transmitted every hour, while masterdata is updated once or several times per day. Contact Ibistic Support for more information about the schedule set up for you.