VB6 Project/Size Limits?

Hi,

I know the limits for the number of controls on a form.
But what are the other limits for a VB 6 app?
Are there limits for total lines of code?
Limits for total number of variables, classes, forms, ect?
How about EXE size?

The company I work for has a *huge* vb6 app and wonders if we are nearing the limits. So far neither the developers or clients have experienced any specific problems — but we are trying to be pro-active.

Any info?