Hold the BONG at T-20:50.
Irritating. Been waiting 15 minutes for an update on the hold. They're saying it's an engine chill issue.
If they are anything like SpaceX when it comes to temperature sensitivity of propellants, they only have a little while before the propellants warm and are going to do nasty things like cavitate the turbopumps.
...and as I'm writing this, they just reset the clock and we're at T-30:00.
If they hold again, I'm going to bed rather than wait for a second resumption.