There is no documented size limitation for a VAIL procedure because doing so would be difficult. Internally, Groovy code is generated from the VAIL code in your procedure. However, the problem with declaring an exact size limitation is that there is not a 1 to 1 relationship between VAIL and the generated Groovy.
For what it is worth, the Groovy limit for a method is 64Kb. But, depending upon your VAIL code, that limit might be reached after 900 lines of VAIL code or, maybe, 1,200 lines of VAIL code.
There is no documented size limitation for a VAIL procedure because doing so would be difficult. Internally, Groovy code is generated from the VAIL code in your procedure. However, the problem with declaring an exact size limitation is that there is not a 1 to 1 relationship between VAIL and the generated Groovy.
For what it is worth, the Groovy limit for a method is 64Kb. But, depending upon your VAIL code, that limit might be reached after 900 lines of VAIL code or, maybe, 1,200 lines of VAIL code.