I was watching coverage of the NROL-71 launch and United Launch Alliance usually precedes launch coverage with informative topics. One of the ones today was the fireball at launch time, just before leaving the ground.
What happened with the launch? As the rocket was about to fully light – we got to the fireball part – then everything stopped.
At this point I am guessing a 24 hour turn-around but that could be very optimistic so the delay could be longer.