Heating - how much time does it take to heat fifth wheel?

I spent few hours on working on the ducting on my camper. Making sure all joints
were not leaking, straightening some of the runs, making sure more heat was going to the living area and restricting heat to the bedroom/bath room. Re-directing the ducts to the area where we spend most of our time.

Made a huge difference to the comfort of the camper. My 27ft camper takes about 15 minutes to feel comfortable and another 20 minutes to get to 70.