Patrick,   A watch index error of 20 secs isn't enough to create an acquisition problem. I was thinking more like 5 minutes.  My experience was I sat down outside about 3 minutes before T-0, took a deep breath and fixed the binos on Mars.  After a 2-3 minutes, I put the binos down, took one deep breath and then put the binos back up to my eyes.  There was X37B about 2/3s of the way through the FOV.  If I had taken 2 breaths and then raised the binos, I would have missed it.  Once acquired with binos, it was faint and could be tracked naked eye from a light polluted site.  But if I tried to acquire it naked-eye, I would have missed it. Most of the difficulty came from that X37B is a fast mover - like 0.5 to 0.75 deg/sec.  That's probably why photos on Spaceweather.com are wide-angle 3-4 deg shots fixed on target star and just show the track.  No one seems to be achieving a telescopic high-mag hand-tracked image. - Kurt