How often does Xignite update ETF holdings data?

How often does Xignite update ETF holdings data? What ETF historical data does Xignite provide for fund flows? Does Xignite offer ETF reference and exposure data? Does Xignite provide exchange-traded products (ETPs) data? What time are end-of-day equity prices available in US markets? Why does the volume from XigniteNASDAQLastSale not match the Last Sale volume on nasdaq.com? What are the NASDAQ Stock Market trading hours? When will historical prices be updated from a stock split on a given date? What are the trading hours for BATS Exchange? Does Xignite support survivorship bias in your historical stock data API? Why is the volume on BATS (CBOE) lower than other exchanges? What types of dividends does Xignite support in its equity APIs?