Bitcoin is more akin to a Forex or Gold than Stock,

Stock futures are 24 hours. I believe the vast majority of equity volume is in stock futures rather than stocks themselves. Institutional investors drive this volume

Your three statements are false.

On notional value bases, he is probably right but we all know how the derivative guys like to lever up and hide it all under layers of synthetic securities.

was recalling info for stock indices rather than individual stocks.

stock index futures are 23 hours: http://www.cmegroup.com/trading-hours.html#equityIndex

stock volume is larger than futures (347B global avg daily volume vs 280 in jan 2016, not sure about now), but futures larger than ETFs (280 vs 88)

youll have to convince me that institutional investors dont drive futures volume, cant find data offhand but wont give you benefit of the doubt on that one :)

Not sure of other countries or brokers but I cannot trade stock futures out of trading hours either on Nasdaq or NYSE