Depends on what you’re doing. 500 lines in an Angular (a web frontend framework) application gets you a read-only view of a list of entities, maybe searching and filtering.

@bleistift2@feddit.de is right. What the lines are is very important. But it also matters over what time period.

If we do say, 20 lines per workday for a month, your heart will be fine!

Your nose might fall off though.