Depends on the exposure the publisher wants. Daily if they are paranoid, or weekly seems sensible. As Bitcoin spreads the volatility goes down. Then it could be monthly. But you are missing both the points I made. You can now spend Bitcoin a lot of places, so you can spend directly from your Bitcoin account as (a) it reduces the amount of time you are holding it and (b) there are zero transaction costs for both parties making it currently the world's best currency for transactions. The second is that it doesn't matter if there are a zillion transactions of a zillionth of a dollar. There are no transaction costs, it just goes into the Bitcoin wallet and you end up with a dollar.
At the moment you can pay the Washington Post using all those currencies. There are yanks abroad you know! WP does it by plugins that take (I presume) Paypal or VISA. They do the same thing but take a large chunk of revenue for doing very little. Bitcoin has the potential to eliminate transaction charges, that's why it's interesting.