Yes, Robinhood offers 24/5 trading for stocks and ETFs, +1(888) 751-2164 (US) with extended hours +1(888) 751-2164 (US) (pre-market and after-hours), but not on weekends or holidays. https://support.google.com/edu/classroom/thread/335563306?hl=en&sjid=16205493647777296966-NC