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Comments
It depends. If you expel the shit at a significant fraction of the speed of light, you don't really need a lot of it. Look at ion thrusters.
The time required is relative TM
if you manage to go at a significant proportion of the speed of light, then the travellers themselves might get to the next solar system in a matter of weeks. Of course I'm not sure if that's useful if their colleagues on Earth wait for many years in the meantime. But that's more of a philosophical debate!
Definitely! That's what the teacher always wrote below my exams: "Great stuff, but off-topic!"
If people didn't dream and hadn't dreamt in the past, then we would all still be sitting in caves and throwing stones
Why would mankind want to go into the solar system and beyond if the Internet isn’t out there yet?
@wim
I've made a REALLY good "audio sketch" that deals with that topic, but unfortunately it's in German 
we are already deep in offtopic, so why not continue..
@SevenSystems This poped to my eyes, pretty interesting
https://phys.org/news/2019-12-discovery-reveals-tractionless-motion.amp
Yeah, it's just in cells for now - but if it is physically posible to have tractionless motion, then sooner or later we will be able to reproduce it on large scale...
@dendy... that is interesting, didn't know something like that existed... it's on a very small scale though and it somehow still sounds a bit like a (accidental) hoax ("active matter")... maybe cells DO in some way "push against" their environment, but those scientists haven't really looked closely enough? Anyway, a good read and research topic for my morning coffee now!
Apart from that though, there IS enough reaction mass in space anyway. Space is not empty at all and has quite a few random hydrogen / helium atoms per cubic metre (often hundreds or thousands depending on where you are), so if you go really fast or have a really large engine intake / fast engine, you will essentially be able to move your spaceship like an airplane. (yes, a spaceship that goes at very high speeds would actually also have to LOOK like an airplane to minimize friction!)
@dendy -- this makes me skeptical as ever:
https://www.askamathematician.com/2017/12/q-is-reactionless-propulsion-possible/
@SevenSystems @tja
That is main point of that article. It is totally agains our current understanding of physics, especially agains Newton's law of action and reaction.
Yes, this is old article BEFORE that discover it pretty much consistently covers current understanding of physics to the date. Reactionless propulsion - not possible.
This is NEW article. Scientist disvovered that it looks like cells are acrually using something which, based on our current understanding of phycics, is not possible.
Possible outcomes:
This is more principal thing, it is not that much important if it is on molecular scale or on big scale - if some elementary physical rule is obviously not working here, it means theory needs to be revisited - that's how science works
There may me some quantum effects as part of game - but this is not much likely, molecular scale is in most cases too big for being affected by quantum effects - but who knows ... There is serious theory that consciousness emerges from quantum processes in neuron's microtubules - so everything is possible 
Anyway - this is serious study based on real experiment - published on serious scientific portal, not some hoax or false news, here is original source:
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.123.248006
So it may me we are on the edge some major breakthrough on part of physics important for developing propulsion engines
It also may be measurement error, of course. Looking forward how this will evolve, especially after it passes through peer review
Here i will be a little bit more speculative. In case it turns out that this discovery is right, it is not error, and there is some serious physics behind which allows breaking this Newton's rule, then main argument of EM Drive opponents will be busted :-)