The amount of data that Rowan can process at any single time — called "context window" — is vast, but has limits nonetheless. There are two ways you could come across these limits: working with large workbooks or having long conversations with Rowan.

You can check if the workbook you're working on is too large (i.e. has a large number of populated cells and sheets) by opening the "Select worksheets" menu from the chat box. Look for the little "spreadsheet" icon. Use this menu to reduce the number of sheets that Rowan should be working on and free up space in his context window.

If a conversation you're having with Rowan becomes too long, Rowan will let you know and create a new chat to reset the limit.