I have a HR24 that I use in my son's room and teke it on the road using a single LNB 18" round SD dish.
I'm looking at getting an 18 x 22 dish with a 3 LNB for HD.
I takes me exactly like Ivylog said, about 10-15 minutes minutes or SD. Plumb the mast with the dish on it, set the azimuth (0-360 degrees) and look at your box.
THe reason it takes so long is because I always forget to set the box to a different dish and no swm (Multiswitch).
Once I do that, I generally get the signal for the satellite in about 5 minutes.
I do carry about 125' of RG6 Coax with me just in case of a tree.
Last fall (thanksgiving) I had to set the dish about 75' on teh side of the road so we could watch the games. It did take me about 10 minutes to set it up.