When I use a friend to do this, it puts me at the entrance inside the instance. If I am out of the instance group it hearths you even if hearth is on cooldown. As far as I can tell there is no way to be ported to the entrance outside the entrance.

I haven't tried again with an alt. It wasn't letting my level 1 alt do the reset but will retry again since someone said it works.

With a friend we've got it to about 30 seconds to go from the end of the instance to starting fresh. With an alt it will be about a minute and some change.