This is how I instance levelled -
Bot1 - Instancebuddy , specific dungeons selected, LEADER PLUGIN.
Bot2 - Instancebuddy, same dungones selected in case something went wrong and it queued on its own.
Initially I started the group. Then just let it do its thing. Both bots generally left after the run almost simultaneously and the bot with leader enabled would re-invite the 2nd and because both had instance buddy enabled would accept the queue when it popped.
Its not afk'able, because things go wrong a lot with instance buddy, but while it was running I was usually just watching movies or some crap and checking on it every 10 or 15.