as per Tod Daniels, it's only 360 days if in practice you can renew the original 180 for another 180 by leaving and re- entering ( or possibly, inside TH but nobody yet knows on this). You won't get 360 upfront.
90 Day reports are mandetory for almost all visas and unrelated to them, except that they may affect the date you need to register by following a visa renewal. Check the page Immigration inserts at the back.