How many "item" entries can Omeka S handle

We are in the process of possibly adopting Omeka S for our historical records and museum objects. Creating a Narrative and exhibition section and item repository. I just want to find out if anyone can give me an indication of how many items can be loaded on Omeka S. We have a few million records that we would to make available on the site. Will Omeka S be able to handle a large database?