So 0.2 will probably take about 1 hour, unless KH3 gets longer world segments. Here's hoping there is some replay value to it more than just replaying it.
Curious to see what new content we'll get in DDD HD
Also, KH3 makes sense in 2017, due to the whole "at least one KH game a year" thing:
KH2 FM+ & KH Re:CoM - 2007
KH Coded - 2008
KH 358/2 Days - 2009
KH BBS - 2010
KH BBSFM & KH Re:Coded - 2011
KH DDD - 2012
KH 1.5 ReMIX & KH Chi - 2013
KH 2.5 ReMIX - 2014
KH Unchained Key - 2015
KH 2.8 Final Chapter Prologue - 2016
KH3 - 2017
They have been pretty consistent about it so I can see it happening.