I only needed the tube soft enough to easily straighten and work the dents out from the inside with a rod inserted in it.
Had I quenched the tube immediately while still red hot it would have become as soft as butter, however once I started heating it I noticed my quench tub was empty so I had to carry it nearly 200 feet to the nearest water source at 66 I no longer even try to run a 60 or 100 yard dash for anything so I walked very briskly the tube was still hot enough to achieve the results I needed that being close to that of a fresh roll of type L refrigeration coper which actually I had a roll of 3/4 that I could have used but why waste a perfect flare and destine a fine piece of tubing to the recycle if I didn't need to.