Subject: highest speed for human space travel

of the various propulsion methods for deep space travel that have been tried, 
that are under development, or that have simply been suggested, are any of 
them likely to achieve one tenth light speed for a vessel able to support human 
life in space? and if so, what acceleration can reasonably be expected, that is, 
how long would it take to get to c/10?

Re: highest speed for human space travel