After what size can a one-pager (SPA) be considered large?

Question

Web development

For some time I have been developing a game on html5 as a hobby and I had a question - after how many lines of business logic can a SPA be called big? Or difficult?
It seems to me that front-end developers have some kind of criteria and metrics for evaluating a SPA in order to evaluate whether the project is large, medium or small? Simple or complex?

Answer 1

I would call it medium at 6 man-months and difficult at 20 man-years.
Approximately on these borders different approaches are used.
What is the total number of lines?

Answer 2

The usual heap paradox