To learn to LD takes different lengths of time for different people. Some can do it in a couple of days, whilst for it other it may take months (though they still say it's worth all the effort they put in).
It took me two weeks.
For the most part, it depends on the amount of effort you put in.
To learn to share a dream - I dunno. Like I said, it's never been proved and only a few people claim to have done it. I guess you could do it from yer first LD...
EDIT: Here's a link with some accounts of shared dreams: http://ld4all.com/forum/viewtopic.php?t=10238
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