In the Blue Origin YouTube video Replay of New Shepard Mission 8 Livestream, the first of several hold starts at
T- 03:00 when the video is at about
T = 00:00 and ignition do not come until more than 22 minutes later at about
38:51 in the video.
Since there is no human payload and the target altitude may be less than that planned for commercial missions, significant boil-off of the cryogenic LH2 and LOX propellants might be tolerable.
I have no idea how the boil-off rate might compare to other launch systems; this part of West Texas is arid desert (today's humidity will be 15% for example), so the cold boil-off vapors would not produce as much visible steam as it would in Florida.
Will the New Shepard be able to have the crew board after fueling and also tolerate substantial launch holds without the crew exiting or refueling or top-offs?
Video is queued just before the beginning of the first hold.