I couldn’t find it either from a quick scout round the usual suspects.
Why do you want to know?
It’ll be a big number – I’ve never heard of anyone running out of DCL’s – they are, after all, only a tag for the compiler.
I struggle to comprehend what you’d be doing in a JCL language that would validly be a big enough single function to run this risk.
Still – I’d be interested in the answer.
(and yes, I do know how much you can accomplish in CLLE and it’s no longer a mere JCL…)