Actually, 40 seconds.
ability_taunt.entity
<?xml version="1.0" encoding="UTF-8"?>
<ability
name="Ability_Taunt"
icon="/ui/legion/icons/taunt.tga"
actiontype="target_entity"
targetscheme="enemy_heroes"
ignoreinvulnerable="true"
anim="taunt_1"
casttime="3000"
castactiontime="0"
cooldowntime="60000"
deferchannelcost="true"
deferchannelimpact="true"
range="1200"
maxlevel="1"
disabled="true"
nostopanim="true"
noresponse="true"
novoiceresponse="true"
nosilence="true"
>
<onimpact />
<onchannelstart>
<aggression source="source_entity" target="target_entity" />
<playtauntsound source="source_entity" target="source_entity" />
<playtauntsound source="source_entity" target="target_entity" />
</onchannelstart>
<onchannelend>
<applystate name="State_Taunting" target="source_entity" duration="40000" />
<applystate name="State_Taunted" target="target_entity" duration="40000" stack="true" />
</onchannelend>
<modifier key="perks" condition="perks" modpriority="100"
maxlevel="0"
disabled="false"
ischanneling="true"
channeltime="0"
>
<onimpact />
</modifier>
</ability>