Add to gnu posts- estimates of stabilization and decommissioning of Fukushima range up to 30 years. Hitachi claims it can do it in ten, but others don't think so.
As noted by gnu, getting through debris and making new connections can't be done overnight.

The Wikipedia write-ups on the Japanese reactors, esp. Fukushima, are informative and up-to-date relative to most summaries I have found. Japan Times has had a number of good articles.