[Avodah] Davening after the Zman

[rabbirichwolpoe at gmail.com]

> ...davening Mincha late. I noticed the time only after I had already
> started to daven Shemone Esreh, and didn't know whether to continue
> or not....
> Harvey

To answer a Q with a Q or 2...

How late is TOO late? 
Just when IS the latest time to daven mincha?
What's the best  source for this latest time?

KT
RRW
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