Nicholas informs us that ...Oosaka and Tookyoo and Yokohama and Aomori are all four beats.

While the 'o' sounds may be long in Osaka and Tokyo, I would be hesitant to pronounce them as two separate letters as appears to be suggested. Tokyo is written in hiragana (the basic Japanese script) as to-o-kyo-o, but the individual 'o' adds length rather than a new sound. It should possibly take as long to pronounce as the others, but I query its 4-syllable pronounciation.

(I'm hoping I've interpreted the original post correctly and may well have no idea what I'm talking about. /disclaimer-e)