Yeah, sorry I can't be more help, but I only know stats for on average how much someone speaks a day. Although, if you consider you listen to many people, and some people you might listen to almost all of their talking for a day, then the stats below are minimal compared to how much you hear.
How many words does each person speak in a day?
Say two words a second. A Politician or businessman might speak for three hours a day, and halve that for the other person talking and you have the following......2x60x60x3 equals, say 20,000 divided by 2 is 10,000.
So we have ten thousand words a day for a talker. For a lonely Nepalese hill farmer without even an Ox to talk to, he might speak 500 words a day. There are many more peasants than captains of industry so average it out at 1,500 words a day per person.
Multiply 1,500 words a day by the number of people, 2,000,000,000 and multiply that by the number of days in 1000years, say 350,000.
Seems a bit complicated still does it? Alright do ‘rounding up and down’
Say 1,000,000,000 people at 2,000 words per day, answer two thousand billion words, easy. Multiply that by the days, 350,000 rounded up to 500,000 because we rounded down the population pretty severely.
Now 500,000 times two thousand billion. Easy again, halve the two to one and add six noughts......1,000,000,000,000,000
One million billion words have been uttered in the last thousand years. Approximately.