How big (file size) can the generated PDF report be?

The maximum file size from a smapForm generated PDF report is 18MB, at least in relation to the "SendReportMail" module, since the report is sent in the e-mail attachment.

If the generated PDF report exceeds 18 MB, it will no longer be sent directly as an e-mail attachment. Instead, the e-mail will contain a link that can be used to download the report.