Maximum number of Lines the Email Subtab of a Marketing Campaign can Hold

Question:
User needs to know up to how many lines or rows may be added to Marketing Campaign > Events tab > Emails subtab when adding a target group, template etc.

Answer:

• Nothing has been hard-coded for the number of lines that the email subtab of a marketing campaign may hold so generally speaking, there is no limit.  
• But eventually performance might be so bad that it'll become pretty much non-functional.  That would probably wouldn't happen until there are 1000s of rows.