Tohei Gakuin, Ki Aikido Institute

If I had two years to dedicate full-time to aikido, this is what I would do! Located at Ki no sato in Tochigi, daily instruction in aikido and ki principles by top instructors in beautiful surroundings - and delicious food. Two years for second dan and instructor qualification.
Check out the home page here.

I can't seem to find cost information in the English pages, so I will include it here:
Entrance fee 200,000 JPY
First year 800,000 JPY
Second year 800,000 JPY
Room (does NOT include cost of meals) 600,000 JPY/year

You must be 18 or older.