This was a great read. This is an article on a person studying the Tall Whites and has come across quite a list of information on them, including the information by Charles Hall. Witnesses and findings.
http://ufodigest.com/article/tall-white-ets
Quite interesting...
I believe they come from the star system Arcturus and go to many stars. Supposedly, at least in the 1950's, it took them approximately 30 days to get from Arcturus to Earth. We were a half way point going to another star system opposite Arcturus. They would have a layover here of about 2 weeks, refuel and refit, then back on their trek to their destination, where ever that was. I am sure their travel time is much less now.