It's on at 9pm until 10:30pm where I am in Canada but we get Boston PBS but I'm one hour ahead of US Eastern but the show times are shown in my local time by my TV provider.

For the US Eastern time zone 8pm to 9:30pm, if US Pacific time does PBS show at the same time or 8pm locally?

There wasn't that easy? lol

I'm guessing 8pm.