As well as Silence is nerfed, it should last for 1 minute but last only a few secons.
Though, Curse of Doom skill from Soul Taker is NOT nerfed...
Silence/fear have a quite long duration for A REASON. The reason is to get rid of enemy team supporters for a while. That's why in TVT events, the team that has a Bishop always wins, because the skills meant to stop healers (fear, silence etc) are not working retail...
Full bishops with infinite mana which cannot be silenced or feared, are just inmortal. That's what I call unbalanced.
Lineage 2 h5 is naturally balanced itself, original files... no need to balance anything.
The current server we got is so unblanaced because of the changes GM did to "balance", which made the opposite effect.
I won't mention names but I know other L2 H5 long term servers with no modifications which are truly balanced, so that's why the high population.