>Your figures are obviously complete rubbish. Be emotional if you wish but please don't attempt to lie about the numbers, it's childish.
Eh, OK, maybe they can keep a space station up for more than 10 minutes without maintenance (it should be obvious that 10 mins was a joke), but if you have a look at the paper "Maintenance, reliability and policies for orbital space station life support systems" by James F. Russella and David M. Klausb, their detailed analysis of skylab and the ISS concluded that over 3 hours a day should be reserved for Environmental Control and Life Support System (ECLSS) maintenance if you have a crew of 2 or 3 people, think about that, 3 hours a day just to keep people alive on a craft in orbit!
So completely unemotionally, the maintenance required to keep people alive in a space station is significant, and new parts take a while to send up, the risk of a failed part on a mars mission is 100% life threatening when you're minutes away, let alone hours, let alone days or months.
Secondly, it would take approximately 9 months to get to mars (at currently attainable speeds), given, when you start the journey don't forget the earth is moving, so you'll have to wait about 3-4 months for a return window (so the earth will be closest after another 9 months), therefore the mission time is approximately 21-22 months round trip (9 months there, 3-4 months wait and 9 months back).
Important numbers; earth is moving about 100,000Km/h, the fastest manned spacecraft (so far) goes about 40,000Km/h, so you have plan to be where the earth will be, coz you won't catch it.
So all my figures so far are "about right".
I admit a couple of fag packet estimates, there has been about 120 space shuttle missions, these have been a combination of low earth orbit (LEO) and geostationary, LEO is obviously no good for transfer to a space station, geostationary missions with a skeletion crew the space shuttles cargo capacity drops from 25,000kg to less than 4,000kg, given a space shuttle weighs about 2,000,000kg it would take 500 missions to get enough "stuff" in geostationary orbit to build something the size of the space shuttle, so as an estimate I'll imagine that you only need about 500,000kg craft (no large first stage, but a much larger biosphere and lots of redundant equipment, there will be no resupply).
Now, these are all (gu)estimates, but they sound about right, certainly not a factor of 10 out.
Finally (I think), I estmate a 36hour mars mission "point of no return", due to the speed of the earth the only way of getting back (while stll moving relatively and on the earth-moon eliptical) is to sling-shot back round the moon ~36 hours, I am not going to attempt the trig to validate this, but I suspect it's about right.
So, nope, my figures are not "obviously complete rubbish" they are in fact "broadly accurate", for a mars mission we need a much larger cargo capacity, much more reliable technology and a very long time to build it, if we do have a successful mars mission this century (mars and back, still alive), then it will be more costly than you could possibly imagine and do very little for "mans colonisation of space".
Moi childish? I think not baby puppy, the idea of manned mars missions are "childish", for decades to come anyway (unless you add the word "suicidal").