I get real time quotes from my broker, or when I was doing daytrading, it cost me a hefty penny to see the market live. I believe they do it like that in order to protect the brokerage firms.
It's very possible for a low volume stock to remain idle (no transactions) while legitimately open for trade.
Market is open Monday to Friday from 9:30 sharp to 4:00 PM EST. And there again it will not be foolproof because of holidays.
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