You run into issues with scaling – again, burn damage scales with the number of people you can burn at any one time. It’s also impossible to have both 30 Virtues and get 100% burn uptime so you can’t get double duration AoE Justices. That said, it’s worth trying just to see if you can make it work – it’s a good way to saturate the enemy team’s condition clearing and in theory it would really help to bring down bunkers.
in sPvP you can use 2 sigils of smoldering en use a 20/20/0/0/30 build to reach 100% burning duration + Permeating Wrath. Apparently they stack.
Downside is you cant use 2-handed weapons.
30% burning duration + 10% condition duration from runes, 20% condition duration from zeal, 20% from radiant fire and 20% from 2 sigils of smoldering