From Mar 28 to April 3, 2015, I was admitted in hospital  for 7 days with pneumonia where I was given antibiotics by IV.  I was  in a private room as I was in isolation for 5 of the 7 days. On discharge, I was told I had to have oxygen full time at 1.5 L/M at rest and 3 L/M for forced exertion.
At home I have an oxygen making machine or concentrator and pumping station to fill up my own tanks. Each tank last 2.75 hours. I always carry two oxygen tanks in the basket of my walker when I go out to shopping centre, doctor appointments and etc.