Japanese · Pronunciation Guide
One short beat, pronounced simply "o" — the w in the romaji spelling is historical and silent in modern speech.
o
A single mora — the shortest thing in the language — and it is grammatically unstressable. It attaches rhythmically to the noun in front of it, so the noun plus を is counted as one continuous run of beats rather than as a word and a separate little word.
Listen: を
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毎朝パンを食べます。
Maiasa pan o tabemasu.
I eat bread every morning.
Listen: 毎朝パンを食べます。
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毎朝パンを食べます places を between パン and 食べます, and you can hear that it takes exactly one beat: pan-o-ta-be-ma-su flows as a single string. Notice too that パン's ん is its own beat, so "pan o" is really three morae, pa-n-o, which English speakers routinely compress into two.
The commonest error is pronouncing the w — saying "wo" because that's how the romaji looks. Standard Japanese dropped that w centuries ago; only in singing or very deliberate archaic speech does it surface. The second error is pausing before it, as English would before a small function word. Glue it to the preceding noun and give it one clean, short o.