Radiation protection is the number #1 problem with sending humans to Mars. This is according to a friend of mine who works for NASA. It would take about one year to fly to Mars. This is also why humans only stay on the International Space Station for a maximum of one year.
Being away from the Earths gravity results in bone loss, distortion of your eyeballs(near sited) and atrophied muscles.
One high level whistle blower walked through a doorway--a normal looking doorway off a hall, IIRC, in El Segundo, CA.
Through the doorway seated at a desk was a Marine guard that informed him he was now in Australia.
Supposedly there are Jump Rooms to the moon and to Mars.
Supposedly a young OThuga had an excursion with a small group of peers . . . to Mars, that way.