A lot of other things will fail before the barrel. 7.62x39 is underbore.
Should get at least 7,500 rounds with near new performance given no damaging cleaning... With 15k to 30k usually what CHF and chrome-lined AK barrels are rated for where you'll start to see accuracy issues due to throat erosion, etc -- that span's due more to how rapidly you fire it, not the bore construction itself... I would expect the Vz58 to be similar.
Can probably keep it going bang and minute of man at common self-defense distances to 50k and maybe even 75k to 100k rounds. IIRC, Russians claim barrel life for their military use 7.62x39 AKs (not the same doctrine and standards as US for M4, etc.) to 80k rounds.
Make sure you have plenty of spare springs, locking blocks, strikers/hammer, bolts, firing pins, extractors, fcg parts and pins, maybe pistons, etc. spare parts, if you're wanting to maximize lifespan of any weapon.
Honestly, with the Russian ammo import ban and Ukraine mess, I'd think that ammo quantity of yours will be exhausted before your Vz58's barrel nears any meaningful level of failure assuming just recreational and non-abusive shooting cadences -- and not shooting for accuracy in competition. And that's if you put it all through your Vz58.
