Can u pull the heater/ac box without dash removal

I did all mine in my duster with the dash in. no glove box liner in. its been a couple years since i did it but I want to say it took maybe 20 minutes to remove and about the same to install. I also didnt have any seats in the car at the time either so it was easy to sprawl out and get to everything and no seats in the way of moving the box in and out.