Since Topical Battles Are Typically Done Over The Forums You'll Be Perfectly Fine. Forum Posts Are Limited To 20,000 Characters (Including Spaces) Which I Highly Doubt You'll Pass By Doing A 80, 120 or even 200 line topical battle.
As far as battles go. You could post 2 battles, one up to 60 or 64 lines and the next one only 20 lines or 60 lines, depending on if you want to do 80 or 120.
Btw @
Pugz You Should Bring Back Round Battles, They Were Utilized Before I'm Sure It's An Easy Task For @Psuedo Nim, Maybe @
NOBLE Can Take A Crack At It.