this is pretty interesting... but doesnt it take time and practice to achieve this level of meditation?

I am not really sure about that, by the look of things I think there will be some who will do this kind of meditation, but on the other hand maybe not, people might see it as a risk.

With any meditation you do, check the time when you begin, then check it when you return to the conscious state.  Did you 'feel' any passing of time?  I would venture to say it is that simple, when in the spirit mode.

it sounds simple but i dont think its that simple to practice

is the use of your own consciousness.  A definition of the word meditation = to think upon!  That is not stopping your mind, merely taking it elsewhere to a comfort zone.  We can think peace and calm even amidst the most disharmonious events of our lives.

So when you use your own consciousness to attune yourself to another place (of your own choosing) in visualization, you can not feel the passing of time, space or anything else around you.   Not all meditations allow you the environment to be that at peace...but the more you practice being in your own mind, the more it is possible.